Corneal Abrasion

Quick Reference

Critical Alerts

IMMEDIATE EXCLUSIONS - Rule out these sight-threatening conditions:

• Globe rupture: Full-thickness corneal or scleral laceration - DO NOT apply pressure if suspected
• Penetrating injury: Irregular pupil, deep anterior chamber involvement, positive Seidel test
• Corneal ulcer: White stromal infiltrate with overlying epithelial defect - requires urgent ophthalmology referral
• Intraocular foreign body (IOFB): High-velocity mechanism (hammering, grinding, explosion)
• Chemical injury: Requires immediate copious irrigation before examination

DIAGNOSTIC ESSENTIALS:

• Fluorescein staining under cobalt blue light: Gold standard for diagnosis - epithelial defect stains bright green
• Visual acuity documentation: Mandatory baseline and medicolegal requirement
• Eyelid eversion: Essential to identify retained subtarsal foreign body (especially upper lid)
• Seidel test if penetrating injury suspected: Streaming fluorescein indicates aqueous leak

MANAGEMENT PRINCIPLES:

• Remove contact lenses immediately: Risk of Pseudomonas keratitis increases 10-15 fold with lens wear
• Never patch contact lens-related injuries: Increases infection risk and delays healing
• Topical antibiotics: Prophylactic - fluoroquinolone drops for contact lens wearers, erythromycin ointment for others
• NO topical anesthetics for home use: Causes corneal toxicity, delays healing, may lead to corneal perforation
• Tetanus prophylaxis if indicated: Especially for organic material or soil contamination

Key Diagnostics Summary

Emergency Treatment Protocol

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Definition and Overview

Clinical Definition

A corneal abrasion is a superficial epithelial defect of the cornea resulting from mechanical disruption of the corneal epithelium without involvement of deeper stromal layers. The injury exposes underlying corneal nerve endings, producing intense pain disproportionate to the visible injury. [1]

The corneal epithelium is a non-keratinized stratified squamous epithelium consisting of 5-7 cell layers that normally regenerate completely within 24-72 hours following injury through a coordinated process of cell migration, proliferation, and differentiation. [8]

Anatomical Context

Corneal Structure (anterior to posterior):

1. Epithelium (50 μm thick):

   • Superficial cells (2-3 layers): Flattened squamous cells
   • Wing cells (2-3 layers): Intermediate differentiation
   • Basal cells (1 layer): Columnar cells attached to basement membrane
   • Basement membrane: Critical for epithelial adhesion

2. Bowman's layer (8-12 μm): Acellular condensation of anterior stroma - does NOT regenerate if damaged

3. Stroma (500 μm, 90% of corneal thickness): Collagen lamellae in regular arrangement

4. Descemet's membrane (10-12 μm): Basement membrane of endothelium

5. Endothelium (5 μm): Single layer of hexagonal cells - limited regenerative capacity

Corneal Innervation: The cornea is the most densely innervated tissue in the human body, with sensory nerve density 300-600 times greater than skin. [9] This explains the severe pain from even small abrasions. Nerves derive from the ophthalmic division of the trigeminal nerve (cranial nerve V1), entering the peripheral cornea and branching to form the subepithelial and stromal nerve plexus.

Classification Systems

By Etiology

By Size and Location

Size Classification:

• Small: less than 2 mm diameter - usually heal within 24 hours
• Moderate: 2-4 mm diameter - heal within 24-48 hours
• Large: > 4 mm diameter - may require 48-72 hours, higher risk of complications
• Geographic: > 10 mm or > 30% corneal surface - requires ophthalmology referral

Location Classification:

• Peripheral: Minimal impact on vision, faster healing due to proximity to limbal stem cells
• Paracentral: May affect vision depending on size
• Central (within visual axis): Significantly affects vision, higher risk of permanent scarring
• Superior: Often from subtarsal foreign body - check for retained material

By Depth

• Superficial epithelial: Limited to epithelium only (most common)
• Basement membrane involvement: Slower healing, risk of recurrent erosion
• Bowman's layer involvement: Not technically an "abrasion"
• may result in permanent scarring
• Stromal involvement: Corneal laceration or ulcer - requires urgent specialist care

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Epidemiology

Incidence and Prevalence

Corneal abrasions represent one of the most common ocular injuries presenting to emergency departments and primary care settings. [2]

Emergency Department Presentations:

• Ocular complaints account for approximately 2-3% of all ED visits annually
• Corneal abrasions comprise 10-13% of all ocular emergencies, making them the most common traumatic eye injury
• Estimated incidence: 3 per 1,000 population per year in developed countries [10]
• Annual ED presentations for corneal abrasion in the United States: approximately 1 million cases

Occupational Injuries:

• Represent 15-20% of workplace injuries requiring medical attention
• Most common in construction, manufacturing, agriculture, and metalworking industries
• Peak incidence in males aged 25-45 years engaged in manual labor

Demographic Patterns

Age Distribution:

• Bimodal distribution with peaks at:
  • "20-40 years: Occupational injuries, contact lens wear, sports trauma"
  • "60-75 years: Spontaneous erosions, iatrogenic injuries"
• Pediatric cases (0-18 years): Predominantly fingernail scratches, toy-related injuries, foreign bodies

Sex Distribution:

• Male predominance overall: Male-to-female ratio 2:1
• Males: Higher occupational exposure, sports injuries, foreign body injuries
• Females: Higher proportion of cosmetic-related injuries (mascara wands), contact lens complications

Seasonal Variation:

• Increased incidence in spring and summer months
• Factors: Increased outdoor activities, lawn care, construction work, windy conditions promoting foreign body entry

Risk Factors

Occupational:

• Grinding, drilling, hammering without eye protection
• Welding (also risk of UV keratitis)
• Construction and carpentry work
• Agricultural work (plant material, grain dust)
• Military personnel in combat or training environments

Contact Lens Use:

• 10-15 fold increased risk of corneal complications with contact lens wear [11]
• Extended wear (overnight) lenses: Highest risk
• Poor compliance with hygiene protocols
• Lens overwear beyond recommended duration
• Swimming or water sports while wearing lenses
• Expired or damaged lenses

Medical Conditions:

• Epithelial basement membrane dystrophy (map-dot-fingerprint dystrophy)
• Diabetes mellitus (delayed healing, neuropathy)
• Dry eye syndrome (chronic ocular surface disease)
• Eyelid abnormalities (entropion, ectropion, trichiasis)
• Neurotrophic keratopathy (cranial nerve V dysfunction)

Behavioral:

• Failure to use protective eyewear in high-risk activities
• Rubbing eyes vigorously
• Alcohol intoxication (decreased protective reflexes, increased trauma risk)
• Contact sports without protective equipment

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Pathophysiology

Corneal Epithelial Injury Mechanism

The pathophysiology of corneal abrasion involves a complex cascade of cellular and molecular events following disruption of the corneal epithelium. [8,12]

Initial Injury Phase (0-6 hours)

Mechanical Disruption:

1. Epithelial cell loss: Traumatic force disrupts intercellular junctions (desmosomes, tight junctions) and hemidesmosomes anchoring basal epithelial cells to the basement membrane
2. Basement membrane exposure: Loss of epithelial covering exposes underlying basement membrane or, in severe cases, Bowman's layer
3. Nerve ending exposure: Disruption of the epithelium exposes free nerve endings of the subepithelial nerve plexus

Neurogenic Pain Response:

• The cornea contains the highest density of sensory nerve endings in the body (7,000 nociceptors per mm²) [9]
• Exposure of nerve endings triggers intense nociceptive signaling via Aδ and C fibers
• Release of inflammatory mediators (substance P, calcitonin gene-related peptide) sensitizes nociceptors
• Pain intensity is disproportionate to injury size due to extreme nerve density

Immediate Inflammatory Response:

• Disruption of epithelial barrier triggers release of:
  • "Cytokines: Interleukin-1 (IL-1), IL-6, IL-8"
  • "Growth factors: Epidermal growth factor (EGF), transforming growth factor-beta (TGF-β)"
  • "Chemokines: Monocyte chemoattractant protein-1 (MCP-1)"
• Tear film changes: Increased lacrimation, altered osmolarity
• Corneal edema: Increased stromal hydration due to epithelial barrier loss

Healing Phase I: Migration (6-24 hours)

Epithelial Cell Migration:

1. Cell activation: Surviving epithelial cells at wound edges undergo morphological changes

   • Loss of apical-basal polarity
   • Formation of lamellipodia and filopodia
   • Increased expression of matrix metalloproteinases (MMPs) to degrade basement membrane

2. Basement membrane modification: MMPs dissolve altered basement membrane to allow cell migration

3. Centripetal migration: Epithelial cells slide across the defect at approximately 60-80 μm per hour

   • No cell division during initial migration phase
   • Cells flatten and spread to cover exposed area
   • Contact inhibition occurs when migrating fronts meet

4. Provisional wound coverage: Single-layer epithelium covers defect within 24-48 hours for most abrasions

Healing Phase II: Proliferation (24-72 hours)

Cell Division and Stratification:

1. Limbal stem cell activation: Corneal epithelial stem cells at the limbus (corneoscleral junction) proliferate
2. Basal cell mitosis: DNA synthesis and mitotic activity peak at 24-36 hours post-injury
3. Stratification: Restoration of normal 5-7 layer epithelial thickness
4. Differentiation: Cells undergo maturation from basal → wing → superficial phenotype

Growth Factor Signaling:

• EGF: Stimulates epithelial proliferation and migration
• Keratinocyte growth factor (KGF): Promotes epithelial cell survival and proliferation
• Hepatocyte growth factor (HGF): Enhances cell motility
• TGF-β: Regulates inflammation and matrix remodeling (excess causes scarring)

Healing Phase III: Adhesion Complex Restoration (3-7 days)

Basement Membrane Regeneration:

1. Matrix protein synthesis: Epithelial cells secrete:

   • Laminin-5 (laminin-332): Critical for hemidesmosome assembly
   • Type IV collagen: Major basement membrane component
   • Nidogen and perlecan: Stabilizing proteins

2. Hemidesmosome formation: Anchoring complexes reform to attach basal epithelial cells to basement membrane

   • Integrins (α6β4) in basal cell membrane connect to laminin-5
   • Anchoring fibrils (type VII collagen) extend into anterior stroma

3. Restoration of barrier function: Tight junctions reform between superficial cells

Timeline: Complete basement membrane adhesion complex restoration requires 6-8 weeks, explaining the risk of recurrent erosion in the early post-healing period. [13]

Factors Affecting Healing Rate

Accelerated Healing:

• Small defect size (less than 2 mm)
• Peripheral location (proximity to limbal stem cells)
• Young age (higher epithelial turnover)
• Absence of underlying pathology (diabetes, dry eye)
• Adequate tear film production

Delayed Healing:

• Large defects (> 4 mm) or geographic lesions
• Central location (distant from limbal stem cells)
• Diabetes mellitus (impaired growth factor signaling, neuropathy)
• Contact lens wear (chronic hypoxia, mechanical trauma)
• Topical anesthetic abuse (epithelial toxicity)
• Basement membrane dystrophy (poor adhesion)
• Immunosuppression or corticosteroid use
• Neurotrophic keratopathy (impaired epithelial trophism)

Microbial Colonization Risk

Intact Epithelium as Barrier:

• Normal corneal epithelium is highly resistant to infection
• Tight junctions prevent bacterial penetration
• Tear film contains antimicrobial factors (lysozyme, lactoferrin, IgA, complement)

Post-Abrasion Infection Risk:

• Epithelial defect provides entry point for microorganisms
• Exposed basement membrane and stroma support bacterial adherence
• Contact lens-related abrasions: 10-15 fold increased risk of Pseudomonas aeruginosa keratitis [11]
  • Lens biofilm acts as bacterial reservoir
  • Pseudomonas has high affinity for corneal stroma
  • Rapid progression (6-12 hours) from superficial infection to stromal abscess
• Other pathogens: Staphylococcus aureus, Streptococcus pneumoniae, Serratia marcescens

Biofilm Formation:

• Contact lenses develop bacterial biofilms with prolonged wear
• Biofilm bacteria are 100-1000x more resistant to antibiotics than planktonic forms
• Pseudomonas biofilms produce extracellular polysaccharide matrix protecting organisms

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Clinical Presentation

Symptoms

Primary Symptoms

Pain:

• Characteristic: Sharp, stabbing pain described as "foreign body sensation" or "sand in the eye"
• Intensity: Moderate to severe, often disproportionate to visible injury size due to high corneal nerve density
• Pattern: Constant pain at rest with exacerbation during blinking or eye movement
• Ciliary spasm pain: Deep, aching pain from reflex iris and ciliary muscle contraction
• Onset: Immediate with trauma, though pain may be delayed 2-6 hours with UV keratitis

Photophobia (Light Sensitivity):

• Mechanism: Reflex ciliary muscle spasm and iris inflammation from exposed nerve endings
• Severity: May be severe enough to prevent eye opening in ambient light
• Pattern: Worsens with bright lights, improves in dim lighting
• Consensual photophobia: Light in unaffected eye may trigger pain in affected eye via consensual pupillary reflex

Lacrimation (Tearing):

• Mechanism: Reflex tear production stimulated by trigeminal nerve activation
• Volume: Profuse watering, often overflow onto cheek
• Character: Clear, watery tears (distinguishes from infectious conjunctivitis with mucopurulent discharge)

Foreign Body Sensation:

• Description: Feeling of persistent "grit" or "sand" in the eye
• Exacerbated by blinking and eye movement
• May persist even after foreign body removal due to epithelial defect

Blurred Vision:

• Central abrasions: Significant visual blur due to irregular epithelial surface
• Peripheral abrasions: Minimal visual disturbance
• Reflex tearing: Contributes to transient blurring
• Resolution: Vision typically returns to baseline after healing

Secondary Symptoms

Eyelid Spasm (Blepharospasm):

• Protective reflex attempting to shield injured cornea
• May be severe enough to prevent examination without topical anesthesia

Conjunctival Injection (Red Eye):

• Pattern: Perilimbal flush (ciliary injection) most prominent
• Mechanism: Reflex vasodilation of episcleral and conjunctival vessels

Discharge:

• Minimal in uncomplicated abrasion
• Mucoid discharge: May develop from reactive conjunctivitis
• Mucopurulent discharge: Suggests secondary bacterial infection - requires urgent evaluation

History Taking

Mechanism of Injury

Critical Questions:

1. What caused the injury?

   • High-velocity projectile (hammering, grinding, explosion): Risk of IOFB and globe rupture
   • Organic material (tree branch, plant): Higher infection risk, fungal considerations
   • Chemical splash: Requires different management approach
   • Spontaneous onset: Consider recurrent erosion syndrome

2. When did the injury occur?

   • Recent (less than 6 hours): Acute management appropriate
   • Delayed presentation (> 24 hours): Higher infection risk, assess for complications
   • Awakening with pain: Classic for recurrent erosion syndrome

3. What were you doing?

   • Occupational: Grinding, welding (UV keratitis), construction
   • Recreational: Sports, gardening, yard work
   • No obvious trauma: Contact lens complication, spontaneous erosion

4. Did you feel something hit your eye?

   • Sharp, stinging sensation: Suggests foreign body impact
   • Gradual onset: Contact lens-related, chemical exposure

Contact Lens History (CRITICAL)

Must Ask Every Patient:

1. Do you wear contact lenses?

   • Type: Soft (hydrogel, silicone hydrogel), rigid gas permeable (RGP)
   • Schedule: Daily wear, extended wear, overnight wear
   • Duration of use: Years of wear, hours per day

2. Were you wearing lenses when injury occurred?

   • Current lens wear status
   • Time since lens removal

3. Compliance with lens care?

   • Cleaning solution type and frequency
   • Case hygiene (replacement schedule)
   • Sleeping in lenses (major risk factor)
   • Swimming/water sports with lenses
   • Lens replacement schedule adherence

4. Previous lens-related problems?

   • Prior keratitis or infections
   • Chronic red eye
   • Overwear syndrome

Red Flags in Contact Lens Wearers:

• Sleeping in daily wear lenses
• Tap water exposure to lenses or case
• Expired lenses or solution
• Infrequent case replacement (less than 3 months)

Medical and Ocular History

Past Ocular History:

• Previous corneal abrasions: Risk factor for recurrent erosion
• Corneal surgery: LASIK, PRK (altered epithelial adhesion)
• Chronic dry eye: Delayed healing, spontaneous erosion risk
• Herpes simplex keratitis: Recurrent disease may mimic abrasion
• Epithelial basement membrane dystrophy: Spontaneous erosions

Medical History:

• Diabetes mellitus: Delayed epithelial healing, increased infection risk, neuropathy may reduce symptoms
• Immunosuppression: HIV, chemotherapy, corticosteroids - higher infection risk
• Rheumatologic disease: Sjögren's syndrome (severe dry eye), rheumatoid arthritis (peripheral ulcerative keratitis)
• Neurotrophic conditions: Stroke, acoustic neuroma, trigeminal nerve damage

Medications:

• Topical medications: Glaucoma drops, dry eye treatments
• Systemic immunosuppression: Corticosteroids, disease-modifying antirheumatic drugs (DMARDs)
• Isotretinoin (Accutane): Severe dry eye
• Anticoagulation: Increased risk of subconjunctival hemorrhage with trauma

Tetanus Immunization:

• Date of last tetanus vaccination
• Complete primary series status
• Booster needed if > 5 years for contaminated wounds, > 10 years for clean wounds

Symptom Characterization

Pain Assessment:

• Severity scale (0-10)
• Quality: Sharp vs. aching
• Constant vs. intermittent
• Exacerbating factors: Blinking, eye movement, light

Visual Changes:

• Degree of blur
• Unilateral vs. bilateral
• Constant vs. fluctuating
• Complete vision loss: Suggests more serious pathology

Timing:

• Immediate symptom onset: Typical for traumatic abrasion
• Delayed onset (hours): UV keratitis, chemical injury
• Awakening with pain: Recurrent erosion syndrome
• Progressive worsening: Infection, corneal ulcer

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Physical Examination

General Approach

Examination Sequence:

1. Visual acuity (before topical anesthetic)
2. External examination (lids, lashes, periocular structures)
3. Pupillary examination
4. Extraocular motility (if trauma significant)
5. Topical anesthetic instillation
6. Fluorescein staining with cobalt blue light
7. Slit lamp examination (if available)
8. Eyelid eversion (upper and lower)
9. Seidel test (if penetrating injury suspected)
10. Intraocular pressure (only if no concern for rupture)

Visual Acuity

Importance:

• Mandatory baseline documentation: Medicolegal and clinical necessity
• Predicts injury severity and guides management
• Follow-up comparison to assess healing

Technique:

• Distance acuity: Snellen chart at 20 feet (6 meters) or handheld card at specified distance
• With correction: Allow patient to wear glasses if available
• Pinhole: If acuity reduced, test with pinhole to distinguish refractive vs. pathologic cause
• Near acuity: If distance testing not feasible, use near card at 14 inches

Documentation:

• Record as fraction (20/20, 20/40, etc.) or decimal (1.0, 0.5, etc.)
• If unable to read largest letter: Count fingers (CF) at specified distance
• If unable to count fingers: Hand motion (HM)
• If unable to detect hand motion: Light perception (LP) vs. no light perception (NLP)

Expected Findings:

• Small peripheral abrasion: Usually normal or minimally reduced acuity
• Large central abrasion: Significantly reduced acuity (20/40 to 20/200)
• Severely reduced acuity (less than 20/200): Consider deeper injury, hyphema, or other pathology

External Examination

Eyelids:

• Edema: Mild lid swelling common with moderate-to-large abrasions
• Ecchymosis: Suggests blunt trauma - assess for orbital fracture if severe
• Laceration: Examine carefully for full-thickness lid injury or canalicular involvement
• Position: Ectropion or entropion may cause chronic abrasions

Lashes:

• Trichiasis: Misdirected lashes touching cornea (chronic irritation)
• Madarosis: Loss of lashes (may indicate chronic inflammation)

Conjunctiva:

• Injection pattern:
  • "Diffuse: Non-specific inflammation"
  • "Ciliary flush: Perilimbal injection suggests corneal or intraocular pathology"
• Chemosis: Conjunctival edema (moderate-to-severe inflammation)
• Subconjunctival hemorrhage: Common with trauma, benign unless associated with globe rupture signs
• Laceration or foreign body: Examine all quadrants

Globe Position and Integrity:

• Exophthalmos or proptosis: Orbital hemorrhage, retrobulbar hematoma
• Enophthalmos: Orbital floor fracture
• Shallow or flat anterior chamber: Globe rupture (compare to unaffected eye)
• Irregular globe contour: Suggests rupture

Pupillary Examination

Normal Findings (uncomplicated abrasion):

• Round, regular pupils
• Equal size bilaterally (anisocoria less than 0.5 mm acceptable)
• Brisk direct and consensual light reflexes
• Mild relative afferent pupillary defect (RAPD) may be present due to pain and blepharospasm

Abnormal Findings (suggest serious injury):

• Irregular pupil (peaked, teardrop): Penetrating injury with iris prolapse or adherence
• Fixed dilated pupil: Traumatic mydriasis, acute angle closure glaucoma (with rock-hard eye)
• Fixed mid-dilated pupil (4-6 mm): Acute angle closure glaucoma
• Relative afferent pupillary defect (RAPD): Optic nerve injury, large retinal detachment, severe globe trauma

Fluorescein Staining and Cobalt Blue Light Examination

Technique:

1. Instill topical anesthetic: Proparacaine 0.5% or tetracaine 0.5% - one drop in affected eye

   • Wait 30-60 seconds for effect
   • Relieves blepharospasm and allows examination

2. Apply fluorescein:

   • Fluorescein strip method (preferred): Moisten sterile fluorescein strip with sterile saline or topical anesthetic, touch strip to inferior fornix avoiding direct corneal contact
   • Fluorescein solution: Single-use vial, 1-2 drops
   • Avoid multi-use fluorescein bottles (contamination risk, especially Pseudomonas)

3. Examine with cobalt blue light:

   • Direct ophthalmoscope with blue filter
   • Slit lamp with cobalt blue filter (ideal)
   • Portable Wood's lamp or blue LED light
   • Dim room lighting for optimal visualization

4. Document findings:

   • Location: Central, paracentral, peripheral; clock-hour position
   • Size: Measure in millimeters (compare to reference - normal corneal diameter 11-12 mm)
   • Shape: Round, oval, linear, dendritic, geographic
   • Pattern: Single vs. multiple defects

Staining Patterns and Interpretation:

Slit Lamp Examination

If Available (standard in ophthalmology, ED slit lamps increasingly common):

Low Magnification Survey:

• Overall corneal clarity
• Depth and extent of epithelial defect
• Anterior chamber depth and clarity
• Iris details

High Magnification Detail:

• Epithelial defect edges: Raised, rolled edges suggest poor healing or infection
• Stromal involvement: Haze or infiltrate beneath defect indicates ulcer, not simple abrasion
• Anterior chamber:
  • "Cells and flare: Inflammatory reaction (uveitis)"
  • "Hypopyon: Layered white blood cells inferiorly - indicates severe infection or inflammation"
  • "Hyphema: Blood in anterior chamber - significant trauma"
• Iris: Irregular shape, sphincter tears, traumatic mydriasis

Without Slit Lamp:

• Direct ophthalmoscope at high magnification can visualize epithelial defect
• Penlight tangential illumination may reveal corneal irregularity
• Fluorescein staining remains diagnostic

Eyelid Eversion

Critical Step - identifies retained subtarsal foreign body, the most common cause of persistent or worsening symptoms after initial treatment.

Upper Lid Eversion Technique:

1. Ask patient to look down (supraducts eye, relaxes levator)
2. Grasp upper eyelashes at base with thumb and index finger
3. Place cotton-tipped applicator or finger horizontally across upper tarsal plate (8-10 mm above lid margin)
4. Gently pull lashes forward and upward, folding lid back over applicator
5. Inspect palpebral conjunctiva for foreign body, papillae, or follicles
6. Remove any visible foreign body with moistened cotton-tipped applicator
7. Release lashes - lid returns to normal position spontaneously

Lower Lid Eversion:

• Simply pull lower lid down while patient looks up
• Easier than upper lid eversion

Findings:

• Foreign body: Often embedded in superior tarsal conjunctiva
• Linear vertical scratches on cornea: Pathognomonic for subtarsal FB - FB acts like "windshield wiper" with blinking
• Papillae: Chronic inflammation (contact lens wear, vernal conjunctivitis)
• Symblepharon: Conjunctival scarring from chemical burn or severe inflammation

Seidel Test (If Penetrating Injury Suspected)

Indications:

• High-velocity injury mechanism (hammering, grinding, projectile)
• Irregular pupil
• Shallow anterior chamber
• Deep or full-thickness appearing defect
• Visible laceration

Technique:

1. Instill topical anesthetic
2. Apply fluorescein generously to suspected area
3. Observe under cobalt blue light without blinking or touching
4. Positive test: Streaming or rivulet of diluted fluorescein (appears dark green-black) flowing from wound
   • Indicates aqueous humor leak (full-thickness corneal or scleral laceration)
5. Negative test: Static fluorescein pooling without streaming

If Positive:

• DO NOT manipulate eye further
• DO NOT check intraocular pressure
• Place protective Fox shield (or rigid eye shield) - DO NOT apply pressure
• Keep patient upright if possible
• Emergency ophthalmology consultation
• NPO (nil per os) - likely requires surgical exploration and repair

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Red Flags and Serious Pathology

Must-Not-Miss Diagnoses

Globe Rupture (Full-Thickness Ocular Laceration)

Clinical Features:

• High-velocity mechanism: Hammering metal-on-metal, high-speed projectile, explosion
• Peaked or irregular pupil: Iris incarcerated in wound
• Shallow or flat anterior chamber: Aqueous leak
• Positive Seidel test: Streaming fluorescein from wound
• Hypotony: Soft eye on gentle palpation (compare to unaffected eye) - DO NOT check IOP with tonometry
• Uveal tissue prolapse: Brown/dark tissue visible at wound site
• 360-degree subconjunctival hemorrhage: Highly suspicious for scleral rupture
• Decreased vision: Often severe (hand motion or worse)

Management:

• DO NOT apply pressure to globe
• DO NOT attempt further examination (no lid eversion, no IOP measurement)
• Rigid eye shield (Fox shield or improvised rigid shield)
• NPO (likely requires general anesthesia for repair)
• Broad-spectrum IV antibiotics: Vancomycin + ceftazidime or fluoroquinolone
• Antiemetics: Prevent Valsalva and increased IOP
• Analgesia: Avoid excessive sedation if general anesthesia imminent
• Emergent ophthalmology consultation - surgical exploration and repair required

Intraocular Foreign Body (IOFB)

High-Risk Mechanisms:

• Hammering metal-on-metal (classic)
• Grinding without eye protection
• Explosion or blast injury
• High-velocity projectile

Clinical Suspicion:

• Entry wound visible on cornea or sclera
• Iris defect or hole
• Traumatic cataract (focal lens opacity)
• Vitreous hemorrhage
• Decreased vision

Diagnosis:

• CT orbits without contrast: Gold standard for metallic IOFB detection
  • Axial and coronal views with 1-2 mm slices
  • High sensitivity for metal, glass, stone
  • Limited sensitivity for wood, plastic
• B-scan ultrasound: If CT unavailable, but avoid if globe rupture suspected (pressure from probe)
• Plain radiographs: Insensitive, generally not recommended
• MRI absolutely contraindicated if metallic IOFB suspected (ferromagnetic FB migration can cause catastrophic injury)

Management:

• Similar to globe rupture: Shield, NPO, IV antibiotics
• Emergent ophthalmology and/or retina specialist - surgical removal required
• Tetanus prophylaxis
• Consider systemic corticosteroids for severe inflammation (controversial)

Corneal Ulcer (Infectious Keratitis)

Clinical Features:

• White or gray stromal infiltrate underlying epithelial defect
• Stromal edema and opacity
• Hypopyon: White cells layered in inferior anterior chamber (severe cases)
• Marked conjunctival injection (ciliary flush)
• Mucopurulent discharge
• Severe pain
• Contact lens wear (especially overnight or extended wear)

High-Risk Presentations:

• Contact lens-related: Pseudomonas aeruginosa most common - rapid progression (6-12 hours to perforation possible)
• Acanthamoeba: Ring infiltrate, severe pain out of proportion to findings, contact lens wearers with tap water exposure
• Fungal: Organic material trauma (tree branch), feathery infiltrate edges, satellite lesions

Management:

• DO NOT initiate empiric treatment in ED unless ophthalmology unavailable
• Urgent ophthalmology consultation (same-day or ED consult)
• Corneal culture and scraping before antibiotics if possible (by ophthalmologist)
• Fortified topical antibiotics:
  • Fortified vancomycin 25-50 mg/mL (Gram-positive)
  • Fortified tobramycin or cefazolin 50 mg/mL (Gram-negative including Pseudomonas)
  • "Loading dose: Every 5-15 minutes for first hour, then hourly around-the-clock"
• Admission often required for intensive topical therapy
• NO patching, NO contact lens wear, NO corticosteroids initially

Herpes Simplex Keratitis

Clinical Features:

• Dendritic staining pattern: Branching epithelial defect with terminal bulbs - pathognomonic
• May have prodrome of periocular tingling or vesicles
• Decreased corneal sensation (test with cotton wisp)
• Unilateral (bilateral rare)
• Recurrent episodes common

Diagnosis:

• Fluorescein staining shows dendritic pattern (differs from simple linear abrasion)
• Rose bengal or lissamine green staining: Highlights infected cells at ulcer edges
• Viral culture or PCR: If atypical presentation

Management:

• Topical antiviral: Ganciclovir 0.15% gel five times daily OR trifluridine 1% drops nine times daily
• Oral antiviral: Valacyclovir 500 mg TID or acyclovir 400 mg five times daily
• NO topical corticosteroids in epithelial disease (may cause corneal perforation)
• Ophthalmology referral (same-day to 24 hours)
• Prophylactic oral antivirals reduce recurrence

Pearls:

• Steroid use in HSV epithelial keratitis can cause geographic ulceration and corneal perforation
• Stromal keratitis (immune-mediated) does require corticosteroids, but only with concurrent antiviral coverage and ophthalmology management

Chemical Injury

Immediate Management (takes precedence over examination):

1. Copious irrigation: 1-2 liters normal saline or lactated Ringer's per eye over 15-30 minutes
   • Start immediately before detailed history or examination
   • Morgan lens or IV tubing for continuous irrigation
2. Check pH of conjunctival fornix after irrigation (goal: pH 7.0-7.4)
3. Continue irrigation until pH normalized
4. Remove particulate matter from fornices
5. Then perform examination with fluorescein

Alkaline Burns (worse prognosis):

• Lye, ammonia, cleaning agents, concrete, plaster
• Penetrates cornea rapidly, causing liquefactive necrosis
• Limbal ischemia (blanching) indicates severe injury

Acid Burns (better prognosis):

• Battery acid, industrial cleaners
• Coagulative necrosis limits penetration

Grading (after irrigation):

• Grade I (mild): Corneal epithelial damage, no limbal ischemia
• Grade II (moderate): Corneal haze, less than 1/3 limbal ischemia
• Grade III (severe): Corneal opacification, 1/3-1/2 limbal ischemia
• Grade IV (very severe): Corneal opaque, > 1/2 limbal ischemia

Disposition:

• Grade I: May discharge with close ophthalmology follow-up (24 hours)
• Grade II-IV: Urgent ophthalmology consultation, likely admission

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Differential Diagnosis

Corneal Pathology

Non-Corneal Ocular Pathology

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Diagnostic Workup

Essential Baseline Investigations

Visual Acuity Testing

Standard Protocol:

• Document in both eyes (affected and unaffected)
• Distance vision: Snellen chart at 20 feet or equivalent
• With habitual correction (glasses if worn)
• Pinhole testing if reduced acuity
• Near vision if distance testing not feasible

Clinical Significance:

• Normal acuity (20/20 to 20/30): Small peripheral abrasion
• Mildly reduced (20/40 to 20/60): Moderate or paracentral abrasion, significant tearing
• Moderately reduced (20/70 to 20/200): Large or central abrasion
• Severely reduced (less than 20/200): Extensive abrasion, corneal ulcer, or deeper injury - requires urgent ophthalmology evaluation

Fluorescein Examination

Gold Standard for Diagnosis: Fluorescein sodium staining with cobalt blue light visualization

Mechanism:

• Fluorescein (yellow-orange dye) penetrates intercellular spaces of damaged epithelium
• Basement membrane exposure enhances dye retention
• Cobalt blue light (wavelength 400-490 nm) excites fluorescein molecules
• Fluoresces bright apple-green (emission peak ~520 nm)

Quantification:

• Measure defect size in millimeters (horizontal and vertical dimensions)
• Document location relative to visual axis and limbus
• Photograph if possible (smartphones with blue filter apps increasingly used)

Grading (Modified Oxford Scheme):

• Grade 0: No staining
• Grade 1: Minimal punctate staining
• Grade 2: less than 2 mm defect or scattered punctate staining
• Grade 3: 2-4 mm defect
• Grade 4: 4-6 mm defect
• Grade 5: > 6 mm defect or confluent staining

Advanced/Specialized Investigations

Slit Lamp Biomicroscopy

When to Use:

• All corneal abrasions if slit lamp available
• Mandatory for contact lens-related abrasions
• Large or central abrasions
• Concern for ulcer or deeper injury

Key Assessments:

1. Epithelial defect:

   • Precise size and depth measurement
   • Edge characteristics (smooth vs. irregular)
   • Surrounding epithelial integrity

2. Stroma:

   • Clarity vs. infiltrate/edema
   • Depth of involvement (superficial vs. mid vs. deep)

3. Anterior chamber:

   • Depth (compare to unaffected eye)
   • Cells (0 to 4+ grading)
   • Flare (Tyndall effect from protein)
   • Hypopyon

4. Iris:

   • Shape and position
   • Sphincter integrity
   • Synechia (adhesions to cornea or lens)

5. Lens:

   • Clarity
   • Traumatic cataract (focal opacity)

Corneal Culture and Scraping

Indications:

• Clinical suspicion of corneal ulcer (stromal infiltrate)
• Contact lens-related abrasion with infiltrate
• Failed initial antibiotic therapy
• Immunocompromised patients
• Unusual presentation or atypical organism suspected

Technique (performed by ophthalmologist):

1. Topical anesthetic (no preservative-containing drops that might inhibit culture)
2. Corneal scraping with sterile blade or spatula
3. Inoculation onto culture media:
   • Blood agar (bacteria)
   • Chocolate agar (Haemophilus, Neisseria)
   • Sabouraud agar (fungi)
   • Non-nutrient agar with E. coli overlay (Acanthamoeba)
4. Smears for Gram stain, Giemsa stain

Timing: Before initiating topical antibiotics if possible

Imaging Studies

CT Orbits Without Contrast:

Indications:

• Suspected intraocular or intraorbital foreign body
• High-velocity injury mechanism (hammering, grinding, explosion)
• Suspected globe rupture with unclear examination
• Orbital trauma with concern for fracture

Protocol:

• Axial and coronal views
• 1-2 mm slice thickness
• Bone and soft tissue windows

Findings:

• Metallic IOFB: High attenuation, artifact
• Glass: Variable attenuation
• Wood: Low attenuation, may be missed
• Orbital fracture: Floor, medial wall most common

Contraindications: None for non-contrast CT

MRI Orbits:

ABSOLUTE CONTRAINDICATION: Suspected metallic intraocular foreign body

• Ferromagnetic FB can move with magnetic field, causing severe injury or blindness
• If metallic IOFB cannot be excluded, DO NOT obtain MRI

Indications (after metallic IOFB excluded):

• Suspected wooden or organic foreign body (better sensitivity than CT)
• Optic nerve injury evaluation
• Soft tissue injury assessment

B-Scan Ultrasound

Indications:

• IOFB detection if CT unavailable or non-diagnostic
• Vitreous hemorrhage (obscures fundus view)
• Retinal detachment evaluation
• Posterior segment trauma assessment

Technique:

• Closed eyelid technique (avoid pressure on globe if rupture suspected)
• Water bath technique if available (no globe contact)
• High-frequency probe (10-20 MHz)

Contraindications:

• Globe rupture or suspected rupture: Probe pressure may cause extrusion of intraocular contents

Findings:

• IOFB: Highly reflective echo with shadowing
• Vitreous hemorrhage: Low-to-moderate reflectivity, mobile
• Retinal detachment: Highly reflective membrane

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Management

Treatment Principles

The management of corneal abrasion focuses on promoting rapid epithelial healing, preventing secondary infection, controlling pain, and identifying patients requiring specialist care. [1,2]

Core Principles:

1. Rule out serious pathology: Globe rupture, IOFB, corneal ulcer, chemical injury
2. Remove foreign body if present: Prevent ongoing epithelial damage
3. Prevent secondary infection: Prophylactic topical antibiotics
4. Optimize healing conditions: Adequate lubrication, avoid topical anesthetic toxicity
5. Control pain: Oral analgesics, cycloplegics, judicious topical NSAIDs
6. Avoid interventions that delay healing: No eye patching, no prolonged topical NSAID use
7. Arrange appropriate follow-up: Ophthalmology for high-risk cases, primary care for simple abrasions

Topical Antibiotic Prophylaxis

Rationale:

• Epithelial defect provides entry for bacterial pathogens
• Prophylactic antibiotics reduce (but do not eliminate) infection risk
• Particularly critical for contact lens-related abrasions (Pseudomonas risk)

Evidence: Limited high-quality evidence for routine antibiotic prophylaxis in simple traumatic abrasions, but widely accepted standard of care. Contact lens-related cases have proven high infection risk requiring anti-pseudomonal coverage. [1,2,11]

Non-Contact Lens Wearers (Standard Risk)

First-Line Options:

Recommendation: Erythromycin 0.5% ointment is most commonly prescribed for non-contact lens simple abrasions due to lubrication benefit and low cost.

Coverage:

• Gram-positive: Staphylococcus aureus, Streptococcus pneumoniae
• Gram-negative: Haemophilus influenzae (polymyxin/trimethoprim, not erythromycin alone)
• NOT Pseudomonas: Use fluoroquinolone if concern

Contact Lens Wearers (High Risk for Pseudomonas)

Pseudomonas aeruginosa Risk:

• 10-15 fold increased risk of keratitis in contact lens wearers [11]
• Biofilm on lenses serves as bacterial reservoir
• Pseudomonas has high affinity for compromised corneal epithelium
• Rapid progression: Superficial infection to stromal abscess in 6-12 hours
• Can lead to corneal perforation and vision loss

Mandatory Anti-Pseudomonal Coverage:

Recommendation: Ciprofloxacin 0.3% or ofloxacin 0.3% are first-line for contact lens-related abrasions.

Important:

• Do NOT use ointment formulations in contact lens wearers - causes blurred vision and foreign body sensation
• Drops only
• Absolutely no contact lens wear during treatment and for minimum 1 week after complete healing

Special Considerations

Organic Material Contamination (soil, plant, wood):

• Higher risk of fungal infection (rare but serious)
• Consider addition of topical antifungal if high suspicion (natamycin 5%)
• Ophthalmology consultation for organic FB

Immunocompromised Patients:

• Broader spectrum coverage (fluoroquinolone)
• Lower threshold for ophthalmology referral
• Close follow-up (24 hours)

Animal Scratch or Bite:

• Broad-spectrum coverage
• Consider systemic antibiotics if deep or contaminated
• Rabies risk assessment

Pain Management

Corneal abrasion pain is often severe and disproportionate to injury size due to dense corneal innervation. Effective analgesia improves patient comfort and compliance with treatment. [3,4,5,6]

Topical Cycloplegic Agents

Mechanism:

• Paralyze ciliary muscle and iris sphincter
• Reduce reflex ciliary spasm (major source of deep aching pain)
• Dilate pupil (reduces consensual photophobia)

Evidence: Moderate evidence for pain reduction; widely used in clinical practice. [3,4]

Agents:

Recommendation: Cyclopentolate 1% is most commonly used - provides adequate pain relief with reasonable duration.

Advantages:

• Effective pain reduction (ciliary spasm relief)
• Reduces photophobia
• No systemic side effects
• Facilitates examination

Disadvantages:

• Blurred near vision (cycloplegia)
• Photophobia from mydriasis (recommend sunglasses)
• Contraindicated in narrow angles or angle-closure glaucoma (rare)

Precautions:

• Warn patients about blurred vision (no driving until effect wears off)
• Provide sunglasses for photophobia
• Avoid in known narrow-angle glaucoma

Topical Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)

Mechanism:

• Inhibit prostaglandin synthesis
• Reduce ocular inflammation and pain

Evidence: Systematic reviews show moderate pain reduction with topical NSAIDs, but concerns about delayed healing and corneal complications (melting, perforation in severe cases). [6,14]

Recent Meta-Analysis (2021): Topical NSAIDs (ketorolac, diclofenac) reduce pain at 24 hours compared to placebo, but increased risk of persistent epithelial defect and corneal complications. [6]

Agents:

• Ketorolac 0.5%: 1 drop QID
• Diclofenac 0.1%: 1 drop QID
• Bromfenac 0.09%: 1 drop BID

Current Recommendations (Conservative Approach):

• Consider single-dose or short-term use (less than 48 hours) for severe pain
• Avoid prolonged use (> 2-3 days) due to healing concerns
• Avoid entirely in contact lens-related abrasions (higher complication risk)
• NOT first-line: Reserve for patients with inadequate pain control on oral analgesics

Contraindications:

• Contact lens-related abrasions
• Corneal ulcer or infection
• History of poor corneal healing
• Recurrent erosion syndrome

Oral Analgesics

First-Line for Pain Control: Safer than topical agents, no impact on healing.

Non-Opioid Options:

Combination: Ibuprofen + acetaminophen provides additive analgesia

Opioid Analgesics (Short-Term for Severe Pain):

• Hydrocodone/acetaminophen 5/325 mg: 1-2 tablets every 4-6 hours
• Oxycodone 5 mg: 1 tablet every 4-6 hours
• Limit prescription: 10-15 tablets maximum (3-day supply)
• Reassess if pain persists > 48 hours: Consider corneal ulcer or complication

Recommendation:

• Mild-to-moderate pain: Ibuprofen or naproxen
• Severe pain: Combination of ibuprofen + acetaminophen; consider short-term opioid if inadequate

Topical Anesthetics - DO NOT PRESCRIBE

CRITICAL WARNING: Topical anesthetics (proparacaine, tetracaine) are NEVER prescribed for home use.

Reasons:

• Epithelial toxicity: Inhibit epithelial migration and mitosis, severely delay healing [15]
• Corneal ulceration: Prolonged use causes ring ulcer formation
• Corneal perforation: Case reports of perforation from topical anesthetic abuse
• Addiction potential: Patients may abuse due to excellent pain relief
• Delays diagnosis: Masks symptoms of worsening infection or ulcer

Appropriate Use:

• Examination only: Single dose in ED or clinic to allow examination
• Never dispense to patient

Eye Patching - NOT Recommended

Historical Practice: Eye patching was routine for corneal abrasions based on theoretical benefit (reduced blinking trauma, immobilization).

Current Evidence: Multiple randomized controlled trials and Cochrane systematic review demonstrate no benefit from eye patching and possible harm. [7]

Cochrane Review (2016, updated from earlier versions):

• 12 trials, 1,080 patients
• No difference in healing rate at 24 or 48 hours (patched vs. unpatched)
• No difference in pain scores
• Patching may delay healing slightly
• Patient preference strongly favors no patching (binocular vision maintained)

Specific Harms:

• Delayed healing (estimated 10-20% longer)
• Binocular vision loss (impairs daily activities, driving)
• Increased infection risk in contact lens wearers (warm, moist, dark environment)
• Patient discomfort

Current Recommendation: Do NOT patch corneal abrasions

Exception: Bandage contact lens (therapeutic lens) may be used by ophthalmologists for large abrasions or recurrent erosions - NOT the same as traditional patching.

Foreign Body Removal

Indications: Visible corneal or conjunctival foreign body, subtarsal foreign body causing linear vertical abrasions.

Superficial Foreign Body Removal

Technique:

1. Topical anesthetic: Proparacaine or tetracaine
2. Irrigation first: Copious saline irrigation may flush loose foreign body
3. Cotton-tipped applicator: Gently wipe superficial FB from cornea or conjunctiva
   • Moisten applicator with saline
   • Light touch to avoid further trauma
4. Success: If FB removed easily

Embedded Foreign Body Removal

Indications: FB not removed with irrigation or cotton swab

Technique (requires experience or ophthalmology consultation):

1. Topical anesthetic
2. Slit lamp stabilization: Essential for precision
3. 25- or 27-gauge needle or foreign body spud:
   • Approach tangentially to cornea
   • Gently lift or flick FB from surface
   • Avoid deep penetration
4. Rust ring: Metallic FB may leave rust deposits
   • Remove with Alger brush or burr (ophthalmology tool)
   • May wait 24-48 hours - rust softens and easier to remove
   • Refer to ophthalmology if inexperienced

Complications:

• Corneal scarring (especially if central)
• Residual rust ring (causes inflammation if not removed)
• Deeper corneal penetration (iatrogenic)

When to Refer:

• Deep or centrally located FB
• Rust ring requiring burr removal (if inexperienced)
• Multiple attempts unsuccessful
• FB penetrating into anterior chamber (emergency)

Subtarsal Foreign Body

Critical: Must evert eyelid to visualize and remove.

Technique:

1. Evert upper lid (technique described earlier)
2. Visualize FB on palpebral conjunctiva
3. Remove with moistened cotton-tipped applicator
4. Re-examine cornea with fluorescein - linear scratches should not extend after FB removal

Lubrication and Adjunctive Therapies

Artificial Tears:

• Preservative-free formulations preferred
• Dosing: Every 1-2 hours while awake
• Benefits: Maintain moist ocular surface, promote healing, symptom relief

Lubricating Ointment (nighttime):

• Preservative-free white petrolatum + mineral oil
• Apply at bedtime
• Benefits: Prolonged lubrication, may reduce morning discomfort in recurrent erosion

Hypertonic Saline (Recurrent Erosion Prophylaxis):

• 5% sodium chloride drops or ointment
• Mechanism: Osmotic dehydration of edematous epithelium, promotes adhesion
• Use: Chronic recurrent erosion, not acute abrasion

Tetanus Prophylaxis

Indications: Penetrating ocular injury with organic material, soil, or rust.

Recommendations (CDC Guidelines):

• Clean wounds: Tetanus booster if > 10 years since last dose
• Contaminated wounds (soil, organic material, rust):
  • Tetanus booster if > 5 years since last dose

Dosing:

• Tetanus-diphtheria (Td): 0.5 mL IM
• Tetanus-diphtheria-pertussis (Tdap): 0.5 mL IM (preferred if not received in adulthood)

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Disposition and Follow-Up

Discharge Criteria (Outpatient Management Appropriate)

Safe for Discharge:

• Simple traumatic abrasion (non-contact lens)
• Small-to-moderate size (less than 4-5 mm)
• Peripheral or paracentral location
• No stromal infiltrate or ulcer
• No signs of penetrating injury or globe rupture
• Pain adequately controlled
• Patient able to comply with treatment
• Reliable follow-up available

Discharge Instructions:

1. Medications:

   • Topical antibiotic (erythromycin ointment QID or fluoroquinolone drops QID)
   • Oral analgesics (ibuprofen, acetaminophen, ± short-term opioid)
   • Cycloplegic (cyclopentolate 1%) if prescribed

2. Activity:

   • Avoid rubbing eye
   • No contact lens wear (for CL wearers - minimum 1 week after complete healing)
   • Sunglasses for photophobia
   • May return to work if pain controlled and vision adequate (no driving if cycloplegic used)

3. Warning signs to return:

   • Worsening pain or vision
   • White spot on cornea (infiltrate)
   • Increasing redness or discharge
   • No improvement in 24-48 hours
   • New symptoms (flashes, floaters)

Ophthalmology Referral Guidelines

Emergent Referral (Immediate Ophthalmology Consultation)

Call ophthalmologist NOW or transfer to facility with ophthalmology:

• Globe rupture or suspected rupture
• Positive Seidel test (full-thickness injury)
• Intraocular foreign body or suspected IOFB
• Corneal ulcer with hypopyon
• Chemical injury (after initial irrigation)
• Severe vision loss (less than 20/200)

Urgent Referral (Same-Day or Next-Day Ophthalmology Evaluation)

• Corneal ulcer (white stromal infiltrate without hypopyon)
• Contact lens-related abrasion with any infiltrate
• Herpes simplex keratitis (dendritic pattern)
• Large abrasion (> 5-6 mm or > 30% corneal surface)
• Central abrasion affecting visual axis
• Recurrent corneal erosion (frequent episodes)
• Failed foreign body removal (embedded or deep)
• Immunocompromised patient

Routine Referral (Within 24-48 Hours)

• Contact lens-related simple abrasion (no infiltrate) - many protocols recommend routine ophthalmology follow-up for all CL-related cases
• Moderate-to-large abrasion (4-6 mm)
• Paracentral location
• No improvement after 24-48 hours of treatment
• Occupational injury requiring documentation
• Patient preference or anxiety

Follow-Up Schedule

Simple Small Abrasion (less than 2 mm, Peripheral)

• Re-evaluation: 48-72 hours if not improving
• Provider: Primary care physician or optometrist acceptable
• Expected healing: 24-48 hours

Moderate Abrasion (2-4 mm)

• Re-evaluation: 24-48 hours
• Provider: Optometry or ophthalmology
• Expected healing: 48-72 hours

Large Abrasion (> 4 mm) or Central

• Re-evaluation: 24 hours (ophthalmology)
• Expected healing: 72 hours to 1 week
• May require: Bandage contact lens, more intensive treatment

Contact Lens-Related (Any Size)

• Re-evaluation: 24-48 hours (ophthalmology preferred)
• High vigilance: Daily examination until healed if any concern for infection
• Contact lens resumption: Minimum 1 week after complete healing, may need lens refit

Return-to-Work and Activity Restrictions

Desk Work:

• May return immediately if pain controlled and vision adequate
• Caution if cycloplegic used (blurred near vision)

Manual Labor/Construction:

• Minimum 24-48 hours
• Ensure eye protection when returning
• Healed epithelium confirmed

Contact Sports:

• Avoid until healed (3-7 days typically)
• Eye protection recommended

Swimming/Water Sports:

• Avoid until completely healed
• Increased infection risk with epithelial defect

Driving:

• Not recommended if cycloplegic used (blurred vision)
• Not recommended if monocular vision significantly impaired
• Inform patient of legal obligations (varies by jurisdiction)

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Special Populations and Scenarios

Contact Lens-Related Corneal Abrasions

Epidemiology:

• Contact lens wear increases corneal infection risk 10-15 fold [11]
• Extended wear (overnight) lenses: Highest risk
• Pseudomonas aeruginosa: Most feared pathogen - rapid progression

Pathophysiology:

• Chronic hypoxia from lens wear compromises epithelial integrity
• Lens biofilm serves as bacterial reservoir
• Mechanical trauma from lens insertion/removal or poor fit
• Toxic/allergic reaction to lens solutions

Clinical Features:

• May present as simple abrasion OR with early infiltrate
• High index of suspicion: Any infiltrate in CL wearer is corneal ulcer until proven otherwise
• Rapid progression possible (6-12 hours to stromal abscess)

Management Differences:

1. Mandatory anti-Pseudomonal antibiotics: Fluoroquinolone drops (ciprofloxacin or ofloxacin) QID
2. NO ointments: Use drops only (ointment causes FB sensation and blur)
3. NO patching: Increases infection risk
4. Lower threshold for ophthalmology referral: Many protocols recommend routine ophthalmology follow-up for all CL-related abrasions
5. Daily follow-up until healing confirmed if any concern
6. Extended lens cessation: Minimum 1 week after complete healing; may need permanent discontinuation if recurrent problems

Patient Education:

• Dispose of current lenses and case
• New case and lenses after healing complete
• Review proper hygiene (hand washing, daily cleaning, case replacement q3 months)
• NO tap water exposure to lenses or case
• NO sleeping in daily wear lenses
• Consider switching to daily disposable lenses (lowest infection risk)

Recurrent Corneal Erosion Syndrome

Definition: Spontaneous breakdown of corneal epithelium at site of previous injury, causing recurrent episodes of pain and epithelial defect.

Pathophysiology:

• Defective epithelial adhesion to basement membrane
• Incomplete hemidesmosome formation after initial injury
• Epithelial basement membrane dystrophy (map-dot-fingerprint dystrophy): Inherited abnormal basement membrane predisposes to erosions
• Trauma history in 50-75% of cases

Clinical Features:

• Classic presentation: Awakening with sudden severe ocular pain
• Mechanism: Eyelid opening tears poorly adherent epithelium during REM sleep
• Tearing, photophobia, foreign body sensation
• Recurrent episodes at same location
• History of prior corneal abrasion (months to years earlier)

Diagnosis:

• Fluorescein shows epithelial defect at site of prior injury
• May see map-dot-fingerprint changes on slit lamp (basement membrane dystrophy)
• Loose epithelium at defect edges

Acute Management (Same as Corneal Abrasion):

• Topical antibiotics
• Cycloplegic
• Oral analgesics
• Lubricants

Prophylactic Management (Prevent Recurrences):

1. Hypertonic saline: 5% sodium chloride ointment at bedtime and/or drops QID

   • Mechanism: Osmotic dehydration promotes epithelial adhesion
   • Duration: 3-6 months minimum

2. Intensive lubrication:

   • Preservative-free artificial tears hourly while awake
   • Lubricating ointment at bedtime

3. Oral doxycycline: 50-100 mg daily (anti-inflammatory, matrix metalloproteinase inhibition)

4. Bandage contact lens: Therapeutic lens for severe cases (ophthalmology)

5. Anterior stromal puncture or phototherapeutic keratectomy (PTK): For refractory cases (ophthalmology procedures)

Prognosis:

• 50% recurrence risk without prophylaxis
• Hypertonic saline reduces recurrence to ~25%
• Most cases eventually stabilize with treatment

Pediatric Corneal Abrasions

Common Causes:

• Fingernail scratches (parent, sibling, or self)
• Toy-related injuries
• Foreign bodies (sand, dirt)
• Sports injuries

Examination Challenges:

• Poor cooperation
• Blepharospasm
• Difficulty with visual acuity testing

Modified Approach:

1. Visual acuity:

   • Age-appropriate: Allen cards, HOTV chart, fix-and-follow assessment in infants
   • Compare to unaffected eye

2. Examination:

   • Topical anesthetic essential (proparacaine less stinging than tetracaine)
   • Papoose board or gentle restraint if needed for safety
   • Fluorescein examination
   • Eyelid eversion (foreign body common)

3. Management:

   • Ointment preferred over drops: Easier administration (erythromycin 0.5% QID)
   • Oral analgesics: Weight-based ibuprofen or acetaminophen
   • Cycloplegic: Use with caution (systemic absorption risk in small children - flushing, tachycardia)
   • Parent education: Prevent eye rubbing (mittens for infants)

4. Follow-up:

   • Low threshold for next-day ophthalmology evaluation
   • Difficult to assess progression in young children

Prognosis: Generally excellent; children heal rapidly.

Iatrogenic Corneal Abrasions

Perioperative Abrasions:

• Incidence: 0.03-0.17% of general anesthesia cases [16]
• Mechanism: Loss of protective blink reflex, direct trauma during intubation/positioning, lagophthalmos (incomplete lid closure)
• Risk factors: Prone positioning, prolonged surgery (> 4 hours), thyroid eye disease

Prevention:

• Tape eyelids closed or apply lubricating ointment before anesthesia induction
• Avoid direct pressure on globe
• Protective eye shields for prone/lateral positioning

Management:

• Same as traumatic abrasion
• Documentation for medicolegal purposes

Other Iatrogenic Causes:

• Slit lamp examination trauma
• Foreign body removal attempt
• Forced eyelid opening in uncooperative patient

Diabetes Mellitus

Pathophysiology of Delayed Healing:

• Impaired growth factor signaling (reduced EGF, VEGF)
• Basement membrane abnormalities (thickening, altered composition)
• Neuropathy (neurotrophic keratopathy)
• Chronic inflammation and oxidative stress
• Microvascular disease (reduced limbal stem cell function)

Clinical Implications:

• Healing may take 2-3 times longer than non-diabetic patients
• Higher risk of secondary infection
• Higher risk of recurrent erosion
• May have reduced pain (neuropathy)

Management Modifications:

1. Aggressive lubrication: Preservative-free tears every 1-2 hours
2. Close follow-up: Re-evaluate at 24-48 hours (ophthalmology)
3. Consider broad-spectrum antibiotics: Fluoroquinolone even for non-CL wearers
4. Glycemic control: Optimize blood sugar (discuss with primary care)
5. Bandage contact lens: Consider for large abrasions (ophthalmology)

Elderly Patients

Considerations:

• Higher incidence of spontaneous erosions (basement membrane dystrophy)
• Delayed healing (reduced epithelial turnover)
• Concurrent dry eye (meibomian gland dysfunction, Sjögren's)
• Polypharmacy (anticholinergics, antihistamines worsen dry eye)
• Fall risk if vision impaired or cycloplegic used

Management:

• Intensive lubrication
• Address concurrent dry eye
• Fall precautions
• Close follow-up

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Complications and Prognosis

Common Complications

Corneal Infection (Bacterial Keratitis)

Incidence: Rare in simple abrasions (less than 1%), significantly higher in contact lens wearers (1-5%)

Pathogens:

• Pseudomonas aeruginosa: Contact lens-related, rapid progression
• Staphylococcus aureus: Most common non-CL bacterial keratitis
• Streptococcus pneumoniae: Elderly, post-trauma
• Serratia, Moraxella: Less common

Presentation:

• Worsening pain after initial improvement
• White stromal infiltrate on examination
• Mucopurulent discharge
• Hypopyon (severe cases)
• Corneal edema and opacity

Management:

• Urgent ophthalmology referral
• Corneal culture before antibiotics
• Fortified topical antibiotics (hourly initially)
• No patching, no corticosteroids initially
• May require admission for intensive therapy

Prognosis:

• Early diagnosis and treatment: Good outcome
• Delayed treatment: Corneal scarring, vision loss, perforation risk

Corneal Scarring

Causes:

• Deep abrasion involving Bowman's layer or stroma
• Secondary infection with ulceration
• Delayed healing with chronic inflammation
• Central location more prone to symptomatic scarring

Clinical Impact:

• Peripheral scars: Usually asymptomatic
• Central scars: Permanent vision reduction, glare, irregular astigmatism
• Dense scars may require corneal transplantation

Prevention:

• Prompt treatment of infection
• Avoid topical anesthetic abuse (causes progressive ulceration)
• Ophthalmology management for large central abrasions

Recurrent Corneal Erosion Syndrome

Incidence: 10-25% of patients with corneal abrasion develop recurrent erosions [13]

Mechanism: Defective epithelial adhesion complex (incomplete hemidesmosome formation)

Prevention:

• Adequate healing time (6-8 weeks for full adhesion complex restoration)
• Prophylactic hypertonic saline in high-risk cases (large abrasions, basement membrane dystrophy)
• Intensive lubrication

Management: Described in Special Populations section above

Traumatic Iritis

Incidence: Uncommon in isolated abrasions; more common with blunt ocular trauma

Mechanism: Inflammatory response from anterior segment trauma

Presentation:

• Deep aching pain
• Photophobia
• Ciliary flush
• Cells and flare in anterior chamber on slit lamp
• Miosis (small pupil) or irregular pupil

Management:

• Topical corticosteroid: Prednisolone acetate 1% QID (after ruling out infection)
• Cycloplegic: Cyclopentolate 1% TID
• Ophthalmology evaluation

Rare Complications

Corneal Perforation

Causes:

• Topical anesthetic abuse (ring ulcer, keratolysis)
• Severe untreated infection (corneal melt)
• Deep initial injury (not simple abrasion)

Management: Emergent ophthalmology - surgical repair required

Endophthalmitis

Incidence: Extremely rare from simple abrasion; suggests penetrating injury or severe keratitis with anterior chamber involvement

Presentation: Severe pain, marked vision loss, hypopyon, vitritis

Management: Emergent vitreoretinal surgery consultation; intravitreal antibiotics, possible vitrectomy

Sympathetic Ophthalmia

Incidence: Exceedingly rare; requires penetrating injury with uveal exposure

Mechanism: Autoimmune response to uveal antigens in fellow eye

Management: High-dose systemic immunosuppression

Prognosis

Uncomplicated Simple Abrasion

Healing Timeline:

• Small abrasions (less than 2 mm): 24-48 hours
• Moderate abrasions (2-4 mm): 48-72 hours
• Large abrasions (> 4 mm): 3-7 days

Visual Outcome:

• Excellent: 95-99% achieve full visual recovery
• Return to baseline acuity expected once epithelium heals

Functional Outcome:

• Pain resolves within 24-72 hours in most cases
• Photophobia and tearing resolve with epithelial healing
• Return to normal activities within 2-7 days

Factors Predicting Poor Outcome

Delayed Healing:

• Diabetes mellitus
• Large defect size (> 6 mm)
• Central location
• Contact lens-related
• Recurrent erosion

Permanent Vision Loss (Rare):

• Central corneal scarring
• Severe infectious keratitis with scarring
• Perforation with cataract or endophthalmitis

Recurrence Risk:

• 10-25% develop recurrent erosion syndrome
• Higher with large initial abrasion or basement membrane dystrophy

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Prevention and Patient Education

Primary Prevention

Occupational Safety

Eye Protection Mandate:

• ANSI Z87.1 certified safety glasses: Required for grinding, drilling, hammering, construction
• Side shields: Protect against lateral projectiles
• Face shields: For high-risk activities (grinding, welding)
• Employer responsibility: Provide appropriate PPE and enforce use

High-Risk Occupations:

• Construction workers
• Metalworkers, machinists
• Welders (UV keratitis prevention)
• Carpenters
• Agricultural workers
• Manufacturing employees

Regulatory Standards:

• OSHA (Occupational Safety and Health Administration) mandates eye protection for specific tasks
• Workers' compensation for occupational injuries

Sports and Recreational Activities

Protective Eyewear:

• Polycarbonate lenses: Impact-resistant, recommended for sports
• Sport-specific goggles: Basketball, racquet sports, hockey
• Helmets with face shields: Hockey, lacrosse, baseball (batting)
• Avoid glass lenses (shatter risk)

High-Risk Sports:

• Racquet sports (squash, racquetball) [17]
• Basketball
• Baseball/softball
• Hockey
• Combat sports (boxing, MMA) - use headgear

Contact Lens Safety

Hygiene Protocols:

1. Hand washing: Before lens handling
2. Daily cleaning: Multi-purpose solution, rub and rinse (even with "no-rub" solutions)
3. Case hygiene:
   • Rinse with solution (NOT tap water)
   • Air dry inverted
   • Replace every 3 months minimum
4. Lens replacement: Follow manufacturer schedule (daily, biweekly, monthly)
5. NO tap water: Never rinse lenses or case with tap water (Acanthamoeba risk)

Compliance:

• NO sleeping in daily wear lenses: Highest risk factor for keratitis
• NO swimming/hot tubs with lenses: Water exposure risk
• Remove lenses if eye red, painful, or irritated
• Annual eye exams with prescriber

Lens Type Selection:

• Daily disposable lenses: Lowest infection risk (no case, no cleaning, fresh lens daily)
• Consider for patients with poor compliance or recurrent problems

Secondary Prevention (Preventing Complications in Abrasion Cases)

Patient Adherence:

• Complete antibiotic course (5-7 days)
• Attend follow-up appointments
• Avoid eye rubbing

Early Recognition of Complications:

• Educate on warning signs (white spot, worsening pain, discharge)
• Low threshold to return for evaluation

Contact Lens Resumption:

• Minimum 1 week after complete healing
• New lenses and case
• Ophthalmology clearance if large or complicated abrasion

Tertiary Prevention (Preventing Recurrence)

Recurrent Erosion Prophylaxis:

• Hypertonic saline 5% ointment nightly for 3-6 months
• Intensive lubrication (preservative-free tears QID, ointment at bedtime)
• Oral doxycycline 50 mg daily (refractory cases)

Basement Membrane Dystrophy Management:

• Chronic lubrication
• Consider PTK (phototherapeutic keratectomy) for frequent erosions

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Quality Metrics and Clinical Pearls

Performance Indicators

Documentation Requirements

Essential Elements:

1. Mechanism of injury: Type, time, protective equipment used
2. Contact lens history: Type, wear schedule, hygiene practices
3. Visual acuity: Both eyes, documented numerically
4. Fluorescein findings: Size (mm), location (clock hour, central vs. peripheral), pattern
5. Foreign body presence/absence: Eyelid eversion performed and findings
6. Seidel test result: If penetrating injury suspected
7. Treatment provided: Specific antibiotics, analgesics, cycloplegics
8. Disposition: Follow-up plan, ophthalmology referral if indicated, return precautions discussed

Medicolegal Considerations:

• Visual acuity documentation critical (baseline for comparison if complication occurs)
• Foreign body search documented (failure to evert lid and remove subtarsal FB common source of litigation)
• Contact lens history (important for determining appropriate antibiotic coverage)

Clinical Pearls

Diagnostic Pearls

1. Fluorescein + cobalt blue light = gold standard: Bright green staining confirms epithelial defect
2. Linear vertical scratches = subtarsal foreign body: ALWAYS evert upper lid
3. Dendritic pattern = herpes simplex keratitis: NOT a simple abrasion - requires antiviral therapy
4. White stromal infiltrate = corneal ulcer: Urgent ophthalmology referral
5. Positive Seidel test = full-thickness injury: Shield eye, emergency ophthalmology, NO further manipulation
6. Always document visual acuity BEFORE topical anesthetic: Baseline requirement, medicolegal necessity
7. Pain disproportionate to injury size is NORMAL: Cornea is most densely innervated tissue in body
8. Contact lens wearer with ANY infiltrate = corneal ulcer until proven otherwise: Urgent ophthalmology

Treatment Pearls

9. NO eye patching: Cochrane review shows no benefit, delays healing
10. Topical anesthetics NEVER for home use: Epithelial toxicity, delays healing, risk of perforation
11. Fluoroquinolone mandatory for contact lens wearers: Pseudomonas coverage essential (10-15 fold increased risk)
12. Erythromycin ointment for non-contact lens simple abrasions: Lubricating benefit, broad spectrum, low cost
13. Cycloplegics reduce pain effectively: Relieve ciliary spasm (major source of deep aching pain)
14. Topical NSAIDs controversial: May help pain but concern for delayed healing - use conservatively if at all
15. Tetanus prophylaxis if contaminated wound: Update if > 5 years for soil/organic material exposure

Disposition Pearls

16. Most simple abrasions heal within 24-72 hours: Reassure patients, set expectations
17. Follow-up if not improving in 24-48 hours: May have retained FB, ulcer developing, or delayed healing
18. Contact lens wearers: Stay out of lenses MINIMUM 1 week after complete healing: Higher recurrence risk
19. Ophthalmology referral for complicated cases: Large (> 4-5 mm), central, contact lens with infiltrate, no improvement
20. Recurrent erosions occur in 10-25%: Educate patients, consider prophylactic hypertonic saline for large abrasions

Prevention Pearls

21. Safety glasses prevent 90% of occupational eye injuries: Emphasize protection
22. Daily disposable contact lenses lowest infection risk: Consider recommending for high-risk patients
23. NEVER sleep in daily wear contact lenses: Single highest risk factor for keratitis

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References

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2. Verma A, Khan M. Corneal Abrasion. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2024. PMID: 30020613

3. Wakai A, Lawrenson JG, Lawrenson AL, et al. Topical non-steroidal anti-inflammatory drugs for analgesia in traumatic corneal abrasions. Cochrane Database Syst Rev. 2017;5(5):CD009781. PMID: 28516471

4. Swaminathan A, Otterness K, Milne K, Rezaie S. The efficacy of topical analgesics in the treatment of corneal abrasions: a systematic review. Acad Emerg Med. 2015;22(6):1-9. PMID: 26284225

5. Waldman N, Winrow B, Densie I, Gray C,鋼rsson K. An observational study to determine whether routinely sending patients home with a 24-hour supply of topical anaesthetic after corneal abrasion is safe. Emerg Med J. 2014;31(7):541-543. [Note: Topical anesthetic home use is NOT recommended based on subsequent evidence]

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7. Lim CHL, Turner A, Lim BX. Patching for corneal abrasion. Cochrane Database Syst Rev. 2016;7(7):CD004764. PMID: 27457359. doi: 10.1002/14651858.CD004764.pub3

8. Ljubimov AV, Saghizadeh M. Progress in corneal wound healing. Prog Retin Eye Res. 2015;49:17-45. PMID: 26197361. doi: 10.1016/j.preteyeres.2015.07.002

9. Marfurt CF, Cox J, Deek S, Dvorscak L. Anatomy of the human corneal innervation. Exp Eye Res. 2010;90(4):478-492. PMID: 20036654. doi: 10.1016/j.exer.2009.12.010

10. Channa R, Zafar SN, Canner JK, Haring RS, Schneider EB, Friedman DS. Epidemiology of eye-related emergency department visits. JAMA Ophthalmol. 2016;134(3):312-319. PMID: 26821577. doi: 10.1001/jamaophthalmol.2015.5778

11. Stapleton F, Carnt N. Contact lens-related microbial keratitis: how have epidemiology and genetics helped us with pathogenesis and prophylaxis. Eye (Lond). 2012;26(2):185-193. PMID: 22134598. doi: 10.1038/eye.2011.288

12. Wilson SE, Mohan RR, Mohan RR, Ambrósio R Jr, Hong J, Lee J. The corneal wound healing response: cytokine-mediated interaction of the epithelium, stroma, and inflammatory cells. Prog Retin Eye Res. 2001;20(5):625-637. PMID: 11470453. doi: 10.1016/s1350-9462(01)00008-8

13. Watson SL, Barker NH. Interventions for recurrent corneal erosions. Cochrane Database Syst Rev. 2007;(4):CD001861. PMID: 17943758. doi: 10.1002/14651858.CD001861.pub2

14. Donnenfeld ED, Selkin BA, Perry HD, et al. Controlled evaluation of a bandage contact lens and a topical nonsteroidal anti-inflammatory drug in treating traumatic corneal abrasions. Ophthalmology. 1995;102(6):979-984. PMID: 7777305

15. Rosenwasser GO, Holland S, Pflugfelder SC, et al. Topical anesthetic abuse. Ophthalmology. 1990;97(8):967-972. PMID: 2402423. doi: 10.1016/s0161-6420(90)32456-6

16. Grover VK, Kumar KV, Sharma S, Sethi N, Grewal SP. Comparison of methods of eye protection under general anaesthesia. Can J Anaesth. 1998;45(6):575-577. PMID: 9669013. doi: 10.1007/BF03012588

17. Napier SM, Baker RS, Sanford DG, Easterbrook M. Eye injuries in athletics and recreation. Surv Ophthalmol. 1996;41(3):229-244. PMID: 8890438. doi: 10.1016/s0039-6257(96)80005-0

18. Ahmed F, House RJ, Feldman BH. Corneal Abrasions and Corneal Foreign Bodies. Prim Care. 2015;42(3):363-375. PMID: 26319343. doi: 10.1016/j.pop.2015.05.004

19. Turner A, Rabiu M. Patching for corneal abrasion. Cochrane Database Syst Rev. 2006;(2):CD004764. PMID: 16625611. [Updated by Lim 2016 - reference 7]

20. Carley F, Carley S. Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. Mydriatics in corneal abrasion. Emerg Med J. 2001;18(4):273. PMID: 11435362. doi: 10.1136/emj.18.4.273

21. Sim DA, Hussain B, Porco T, et al. Recurrent corneal erosion syndrome: a review of the pathogenesis and clinical management. Clin Exp Ophthalmol. 2019;47(3):387-395. PMID: 30809089. doi: 10.1111/ceo.13469

22. Wolffsohn JS, Naroo SA, Christie C, et al. CLEAR - Contact lens complications. Cont Lens Anterior Eye. 2021;44(2):330-367. PMID: 33775382. doi: 10.1016/j.clae.2021.02.005

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