Bacterial Conjunctivitis in Adults

*The "Sticky Eye"

• Common, Usually Self-Limiting, But Must Exclude Sight-Threatening Disease.*

1. Clinical Overview

Definition: Bacterial conjunctivitis is an acute or chronic infection of the conjunctival mucous membrane characterised by mucopurulent discharge, conjunctival injection, and lid crusting. While predominantly self-limiting, it requires differentiation from sight-threatening causes of the "red eye" including keratitis, anterior uveitis, and acute angle-closure glaucoma.

Bacterial conjunctivitis represents one of the most common ocular conditions encountered in primary care and emergency settings. A systematic review of 622 patients demonstrated that 50-75% of acute infectious conjunctivitis cases are bacterial in aetiology, with the remainder being viral or allergic. [1]

The clinical importance of bacterial conjunctivitis extends beyond its immediate symptoms. Incorrect diagnosis may lead to inappropriate treatment of more serious conditions, while over-medicalisation contributes to antibiotic resistance. Meta-analysis evidence confirms that most cases resolve spontaneously within 5-7 days without antibiotic treatment, yet topical antibiotics remain widely prescribed. [2]

Key Clinical Messages

The Three Golden Rules

1. Always document Visual Acuity - Reduced VA is NEVER due to simple conjunctivitis
2. Always perform Fluorescein examination - Rules out corneal ulceration/dendrite
3. Never prescribe topical steroids in primary care - Risk of HSV keratitis exacerbation

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2. Epidemiology

Bacterial conjunctivitis demonstrates significant global disease burden with important demographic and seasonal patterns supported by epidemiological evidence.

Incidence and Prevalence

Demographic Distribution

Bacterial conjunctivitis demonstrates a bimodal age distribution with peaks in early childhood and elderly populations. A population-based study of 10,173 patients found that adults aged 18-40 years had the lowest incidence at 4.8 per 1,000 person-years, while adults over 65 years demonstrated incidence of 8.3 per 1,000 person-years. [3]

Sex Distribution: No significant sex predilection exists in adults, though contact lens-related infections show slight female predominance (1.3:1) reflecting higher contact lens use in this demographic. [6]

Risk Factors

Healthcare Utilisation

The economic impact of bacterial conjunctivitis is substantial. Analysis of US healthcare data demonstrated direct medical costs of $857 million annually, with an additional $857 million in indirect costs from lost productivity. The majority of costs derive from pharmacy expenditure (63%) and outpatient visits (29%). [9]

Exam Detail: Exam Point - Epidemiology Data to Quote:

• "Approximately 6 million cases of acute bacterial conjunctivitis occur annually in the United States"
• "The majority (64%) resolve spontaneously within 5 days without treatment"
• "Contact lens wear increases infectious keratitis risk 5-15 fold"

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3. Microbiology: Pathogen Identification

Understanding the causative organisms of bacterial conjunctivitis is essential for appropriate empirical therapy selection and identification of high-risk infections requiring urgent intervention.

Common Pathogens in Adult Bacterial Conjunctivitis

A prospective microbiological study of 283 culture-positive conjunctivitis cases identified Staphylococcus aureus in 46.6% of adult cases, followed by Streptococcus pneumoniae (17.3%) and Haemophilus influenzae (14.4%). [10]

Hyperacute Bacterial Conjunctivitis (Sight-Threatening)

EMERGENCY: Hyperacute conjunctivitis with copious purulent discharge, lid swelling, and rapid progression requires immediate ophthalmological referral and systemic treatment.

Gonococcal conjunctivitis in adults typically results from auto-inoculation from genital infection. A case series demonstrated corneal involvement in 35-40% of untreated cases with risk of perforation within 24-48 hours without appropriate treatment. [11]

Contact Lens-Related Pathogens

A meta-analysis of 9,500 contact lens wearers identified overnight lens wear as the predominant risk factor, increasing microbial keratitis risk 10-15 fold compared to daily wear. [6]

Antimicrobial Resistance Patterns

Antibiotic resistance in ocular pathogens represents an emerging concern. Surveillance data from 2018-2022 demonstrated:

The rising prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in community settings has implications for topical antibiotic selection. A study of ocular MRSA isolates found 23% were community-acquired. [12]

Clinical Pearl: Microbiology Pearl: In uncomplicated bacterial conjunctivitis, routine cultures are NOT indicated. Reserve swabs for: (1) Neonates, (2) Hyperacute presentation, (3) Treatment failure after 7 days, (4) Recurrent episodes, (5) Immunocompromised patients.

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4. Pathophysiology

Conjunctival Anatomy and Defence Mechanisms

The conjunctiva is a thin, translucent mucous membrane that covers the anterior sclera (bulbar conjunctiva) and lines the inner surface of the eyelids (palpebral conjunctiva). Its primary functions include tear film stabilisation, immune surveillance, and mechanical protection.

Histological Structure:

• Epithelium: 2-5 layers of non-keratinised stratified squamous cells with interspersed goblet cells
• Substantia propria: Loose connective tissue containing lymphoid tissue (CALT - Conjunctiva-Associated Lymphoid Tissue)
• Accessory lacrimal glands: Glands of Krause and Wolfring

Tear Film Defence System

The tear film represents the primary barrier against microbial invasion. Its three-layer structure (7-10 microns thickness) provides both mechanical and immunological protection:

Tear Film Antimicrobial Components:

A study quantifying tear antimicrobial activity demonstrated that lysozyme concentration averages 1.2-2.0 mg/mL, representing one of the highest concentrations of any human body fluid. [13]

Mechanism of Bacterial Infection

Stage 1: Adherence and Colonisation

• Bacterial pili and adhesins bind to conjunctival epithelial receptors
• Biofilm formation on damaged or desiccated epithelium
• Disruption of commensal flora (S. epidermidis, Corynebacterium)

Stage 2: Invasion and Inflammation

• Epithelial cell invasion (intracellular pathogens: Chlamydia)
• Toxin release (alpha-haemolysin, leukocidins by S. aureus)
• Pattern Recognition Receptor (PRR) activation
• Toll-like receptor signalling (TLR2, TLR4, TLR5)

Stage 3: Inflammatory Response

• Neutrophil chemotaxis (IL-8, CXCL1)
• Vasodilation (prostaglandins, histamine) → hyperaemia
• Increased vascular permeability → chemosis
• Mucous hypersecretion → discharge
• PMN accumulation → purulent exudate

Exam Detail: Molecular Pathophysiology for Postgraduate Exams:

The innate immune response in bacterial conjunctivitis is primarily mediated through:

1. TLR2: Recognises lipoteichoic acid (Gram-positive), lipoproteins
2. TLR4: Recognises lipopolysaccharide (Gram-negative endotoxin)
3. TLR5: Recognises bacterial flagellin
4. NOD1/NOD2: Intracellular peptidoglycan sensing

Activation triggers NF-κB translocation → pro-inflammatory cytokine transcription (IL-1β, IL-6, TNF-α, IL-8).

Pseudomonas aeruginosa virulence factors:

• Exotoxin A: Inhibits protein synthesis (ADP-ribosylation of EF-2)
• Elastase (LasB): Degrades corneal stromal collagen
• Alkaline protease (AprA): Degrades immunoglobulins
• Type III secretion system: Injects effector proteins into host cells
• Biofilm formation: Confers antibiotic resistance

This explains the rapid corneal stromal melting seen in Pseudomonas keratitis, where proteolytic enzymes can cause perforation within 24-48 hours.

The Biofilm Paradigm

Bacterial biofilm formation on the conjunctival surface and lid margins contributes to chronic and recurrent conjunctivitis. In vitro studies demonstrate that biofilm-embedded S. aureus exhibits up to 1,000-fold increased resistance to topical antibiotics compared to planktonic organisms. [14]

Clinical Relevance of Biofilms:

• Blepharitis-associated recurrent conjunctivitis
• Contact lens case colonisation
• Chronic conjunctivitis refractory to standard treatment
• Lacrimal sac colonisation in dacryocystitis

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5. Clinical Presentation

History Taking

Essential History Components:

Symptoms

Symptoms that EXCLUDE Simple Conjunctivitis:

• Severe pain (keratitis, scleritis, uveitis, glaucoma)
• Visual loss (keratitis, uveitis, glaucoma)
• Photophobia (keratitis, uveitis)
• Haloes around lights (acute glaucoma)

Physical Examination

Systematic Examination Approach:

1. Visual Acuity (MANDATORY)

   • Snellen chart at 6 metres (or 3m with mirror)
   • Document with and without pinhole correction
   • VA should be 6/9 or better; worse = NOT simple conjunctivitis

2. External Inspection

   • Lid position (ptosis suggests severe infection)
   • Lid swelling (mild = bacterial; severe = preseptal/orbital cellulitis)
   • Discharge character at lid margins

3. Conjunctival Examination

   • Injection pattern: diffuse (conjunctivitis) vs ciliary flush (iritis)
   • Chemosis (oedema): mild = typical; severe = hyperacute/allergic
   • Papillae vs follicles (evert lower lid)

4. Corneal Examination

   • Clarity (opacities suggest ulcer)
   • Fluorescein staining with cobalt blue light
   • Anterior chamber depth (shallow = glaucoma risk)

5. Pupil Examination

   • Size (small = iritis; mid-dilated fixed = glaucoma)
   • Reactivity (sluggish = iritis)
   • RAPD (relative afferent pupillary defect)

6. Lymph Node Palpation

   • Pre-auricular lymphadenopathy suggests VIRAL or CHLAMYDIAL
   • Tender pre-auricular node is UNUSUAL in bacterial conjunctivitis

Clinical Signs

Papillae vs Follicles: The Examination Distinction

Clinical Pearl: Examination Pearl: Follicles are NEVER seen in bacterial conjunctivitis. If you see follicles on lower lid eversion, consider: (1) Viral (adenovirus), (2) Chlamydial, (3) Toxic/medicamentosa, (4) Molluscum contagiosum.

Fluorescein Examination

MANDATORY in every red eye presentation - Rules out corneal pathology

Technique:

1. Instil fluorescein (Minims or wetted strip)
2. Examine with cobalt blue light
3. Document any epithelial defects

Fluorescein Patterns:

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6. Differential Diagnosis

The "Red Eye" Differential - A Systematic Approach

Distinguishing Bacterial from Viral Conjunctivitis

A meta-analysis evaluated clinical features distinguishing bacterial from viral conjunctivitis: [1]

Clinical Decision Rule (Rietveld Criteria): [15]

• Bilateral sticky eyelids in the morning
• Purulent discharge throughout the day
• No history of conjunctivitis

If all 3 present: 95% probability of bacterial aetiology.

Hyperacute vs Acute Presentation

Exam Detail: Exam Distinction - Iritis vs Conjunctivitis:

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7. Investigations

When to Investigate

In uncomplicated bacterial conjunctivitis, the diagnosis is CLINICAL. Laboratory investigations are NOT routinely indicated.

Indications for Microbiological Investigation:

Microbiological Techniques

Specimen Collection:

• Swab the lower fornix and tarsal conjunctiva
• Use transport medium (Amies/Stuart's)
• Collect before antibiotic instillation if possible

Laboratory Methods:

Gonococcal Conjunctivitis - Full STI Screen

When gonococcal conjunctivitis is suspected or confirmed, complete sexually transmitted infection screening is mandatory:

• Urogenital Chlamydia and Gonorrhoea NAAT
• Rectal and pharyngeal swabs (if indicated)
• HIV serology
• Syphilis serology
• Hepatitis B and C serology
• Contact tracing through GUM services

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8. Classification Systems

Clinical Severity Classification

Anatomical Classification

Temporal Classification

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9. Management

Management Algorithm

RED EYE PRESENTATION
        │
        ▼
    Check Visual Acuity
        │
        ├─── Reduced VA ──────► URGENT Ophthalmology Referral
        │
        ▼
    Fluorescein Examination
        │
        ├─── Corneal Staining ──► URGENT Ophthalmology (Keratitis)
        │
        ▼
    Contact Lens Wearer?
        │
        ├─── YES ──────────────► SAME-DAY Ophthalmology (Assume Pseudomonas)
        │
        ▼
    Pain/Photophobia?
        │
        ├─── Severe ───────────► URGENT Referral (Uveitis/Scleritis/Glaucoma)
        │
        ▼
    Discharge Character?
        │
        ├─── Hyperacute Pus ───► IMMEDIATE Referral (Gonococcal)
        │
        ▼
    SIMPLE BACTERIAL CONJUNCTIVITIS
        │
        ├─── Mild: Conservative management ± delayed script
        │
        └─── Moderate: Topical antibiotic (Chloramphenicol/Fusidic acid)

Conservative Management

Evidence supports that 60-70% of bacterial conjunctivitis cases resolve spontaneously within 5-7 days. A Cochrane systematic review of 3,673 patients found that antibiotics conferred only modest benefit over placebo. [2]

Conservative Measures:

School/Work Exclusion:

• Public Health England guidance: Exclusion NOT routinely required
• Similar transmission risk to common cold
• Exception: Food handlers with discharge should avoid work

Delayed Prescribing Strategy

A randomised controlled trial (Rose et al., Lancet 2005) of 307 children demonstrated no significant difference in clinical cure at day 7 between immediate antibiotics, delayed antibiotics, and no antibiotics. Delayed prescribing reduced antibiotic use by 47% while maintaining patient satisfaction. [16]

Delayed Prescription Approach:

1. Issue prescription with instructions to wait 2-3 days
2. Use only if symptoms not improving or worsening
3. Reduces unnecessary antibiotic exposure
4. Maintains patient autonomy and safety net

Pharmacological Management

First-Line: Chloramphenicol

Evidence Base: Meta-analysis confirms chloramphenicol achieves clinical cure in 91% by day 10 vs 72% with placebo. [2]

Second-Line: Fusidic Acid (Fucithalmic)

Third-Line: Fluoroquinolones

Reserved for severe cases, contact lens-related infections, or treatment failure.

Fluoroquinolone Advantages:

• Excellent Pseudomonas coverage (essential for CL wearers)
• High tissue penetration
• Concentrated formulations for corneal loading

Fluoroquinolone Cautions:

• Reserve for indicated cases (antibiotic stewardship)
• Risk of corneal deposits with ciprofloxacin
• Avoid in children (theoretical cartilage concerns)

Alternative Agents

Antibiotic Selection Summary

Topical Administration Technique

Correct Drop Instillation:

1. Wash hands thoroughly
2. Tilt head back or lie down
3. Pull down lower eyelid to create pocket
4. Instil ONE drop into pocket (not directly onto cornea)
5. Close eye gently for 1 minute
6. Apply punctal occlusion (press inner corner) to reduce systemic absorption
7. Wait 5 minutes between different drop preparations

For Non-Compliant Children:

• "Closed Eye Technique": Drop placed on inner canthus with eye closed; gravitates in on opening
• Ointment wiped along lid margins may enter on blinking

Clinical Pearl: Prescribing Pearl: Ointment at night + Drops during the day is the gold standard regimen. Ointment provides prolonged contact time during sleep when blinking is absent, while drops avoid daytime visual blurring.

Special Population Management

Contact Lens Wearers

CRITICAL: Any red eye in a contact lens wearer should be treated as presumed microbial keratitis until proven otherwise.

Immediate Actions:

1. Cease contact lens wear immediately
2. Do NOT discard lens or case (save for culture)
3. Assess corneal clarity with fluorescein
4. If ANY corneal staining/opacity → same-day ophthalmology
5. If cornea clear → treat with fluoroquinolone drops (Pseudomonas cover)
6. Follow-up within 24-48 hours
7. Do not resume lens wear until 48h after complete resolution

Prevention Counselling:

• Never sleep in lenses (10-15x increased keratitis risk)
• Never use tap water for lens storage (Acanthamoeba)
• Replace lens case monthly
• Rub-and-rinse technique with appropriate solution
• Consider daily disposables for high-risk patients

Pregnancy and Breastfeeding

Elderly Patients

• Higher risk of blepharitis-associated recurrence
• Consider lid hygiene regimen maintenance
• Assess for dry eye contribution
• Review for diabetes, immunosuppression
• Simpler dosing regimens improve compliance (BD > QDS)

Immunocompromised Patients

• Lower threshold for culture and referral
• Broader antibiotic cover (fluoroquinolone)
• Watch for opportunistic pathogens (fungi, atypical)
• Close follow-up within 48-72 hours

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10. Specific Clinical Scenarios

Hyperacute Gonococcal Conjunctivitis

OPHTHALMIC EMERGENCY - Risk of corneal perforation within 24-48 hours

Clinical Features:

• Incubation 24-48 hours post-exposure
• Massive purulent discharge (reaccumulates within minutes of cleaning)
• Marked lid oedema, chemosis
• Corneal involvement in 35-40% if untreated
• History: Sexual contact, auto-inoculation from urethritis

Immediate Management:

1. Urgent ophthalmology referral
2. Saline irrigation to clear discharge
3. Ceftriaxone 500mg IM or IV STAT (single dose)
4. Topical fluoroquinolone hourly until improvement
5. Full STI screen including Chlamydia co-infection (40-50%)
6. GUM referral for partner notification
7. Consider admission for corneal involvement

If Corneal Perforation:

• Emergency surgery (tissue adhesive, patch graft, or corneal transplant)

Ophthalmia Neonatorum

NOTIFIABLE DISEASE in UK - Conjunctivitis in first 28 days of life

Causative Organisms by Time of Onset:

Mandatory Actions:

1. Admit all neonates with conjunctivitis
2. Conjunctival swab for culture + Chlamydia NAAT
3. Blood cultures if systemic concern
4. Ophthalmology assessment
5. Complete Public Health notification (NOIDS form)
6. Parents require GUM screening

Erythromycin for Chlamydial Ophthalmia:

• Oral erythromycin 50mg/kg/day in 4 divided doses for 14 days
• Topical treatment alone is INSUFFICIENT (systemic reservoir)
• Watch for Chlamydial pneumonia (develops in 10-20%)
• Infantile hypertrophic pyloric stenosis risk (inform parents of symptoms)

Adult Chlamydial Conjunctivitis (Inclusion Conjunctivitis)

Suspect When:

• Chronic conjunctivitis (> 3 weeks) not responding to conventional treatment
• Follicular reaction on lower tarsal conjunctiva
• Young, sexually active adult
• Associated urethritis or cervicitis symptoms
• Tender pre-auricular lymphadenopathy

Diagnostic Confirmation:

• Conjunctival swab for Chlamydia NAAT (sensitivity > 95%)
• Do NOT rely on culture (insensitive)

Treatment:

• Oral doxycycline 100mg BD for 7 days, OR
• Azithromycin 1g PO stat (preferred for compliance)
• PLUS topical azithromycin 1.5% BD for 3 days
• Mandatory GUM referral and partner notification

Angular Blepharoconjunctivitis

Features:

• Erythema and maceration at lateral canthus
• Chronic/recurrent course
• Associated with Moraxella species
• More common in elderly, alcoholics, zinc deficiency

Treatment:

• Bacitracin or fusidic acid ointment to angles
• Zinc supplementation if deficient
• Lid hygiene regimen

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11. Complications

Local Complications

Corneal Scarring

Severe or recurrent corneal infection can result in permanent stromal scarring with visual impairment. A study of gonococcal keratitis outcomes found that 15% of patients had permanent visual impairment despite appropriate treatment. [11]

Spread to Fellow Eye

Bacterial conjunctivitis frequently spreads to the contralateral eye within 24-48 hours via hand contamination. Bilateral involvement occurs in approximately 50% of cases by day 5 of illness.

Systemic Complications

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12. Prognosis and Outcomes

Natural History

Factors Influencing Prognosis

Favourable Prognosis:

• Mild-moderate severity
• No corneal involvement
• Immunocompetent host
• Non-contact lens wearer
• Early presentation

Poor Prognosis:

• Hyperacute presentation
• Contact lens-related
• Corneal involvement at presentation
• Immunocompromised
• Gonococcal aetiology
• Delayed presentation/treatment

Recurrence

Recurrent bacterial conjunctivitis should prompt investigation for:

• Underlying blepharitis (most common)
• Chronic dacryocystitis (lacrimal sac colonisation)
• Nasolacrimal duct obstruction
• Dry eye syndrome
• Undiagnosed Chlamydia
• Contact lens hygiene issues
• Systemic immunodeficiency

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13. Prevention Strategies

Personal Hygiene

• Regular handwashing, especially before touching face/eyes
• Avoid sharing towels, pillows, eye cosmetics
• Replace eye cosmetics every 3-6 months
• Avoid touching eyes with unwashed hands
• Discard eye drops 4 weeks after opening

Contact Lens Hygiene Protocol

Healthcare Settings

• Standard infection control precautions
• Tonometer disinfection between patients
• Hand hygiene between patient examinations
• Adenovirus outbreaks: Enhanced precautions, surface disinfection

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14. Referral Guidelines

Same-Day Ophthalmology Referral

Routine Referral

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15. Key Guidelines and Society Recommendations

NICE Clinical Knowledge Summaries (2023)

• Most cases of acute infective conjunctivitis are self-limiting
• Topical antibiotics shorten duration by 0.3-1 day
• Delayed prescribing is an acceptable strategy
• Chloramphenicol or fusidic acid are first-line agents
• Referral for: reduced VA, corneal involvement, contact lens wearers, neonates

American Academy of Ophthalmology Preferred Practice Pattern (2018)

• Clinical diagnosis; routine cultures not indicated
• Broad-spectrum topical antibiotics for moderate-severe cases
• Fluoroquinolones for contact lens-related infections
• Hyperacute cases require systemic and intensive topical therapy

Public Health England (PHE) Guidance

• School exclusion NOT required for conjunctivitis
• Ophthalmia neonatorum is a notifiable disease
• Epidemic keratoconjunctivitis outbreaks should be reported to Infection Control

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16. Examination Preparation

Common Exam Questions

1. "A 35-year-old contact lens wearer presents with a painful red eye. How would you assess and manage this patient?"
2. "Describe the differences between bacterial, viral, and allergic conjunctivitis."
3. "What are the red flags in a patient presenting with a red eye?"
4. "A neonate presents with sticky eyes at 4 days of age. What is your differential and management?"
5. "Discuss the evidence for antibiotic treatment of bacterial conjunctivitis."

Viva Points

Viva Point: Opening Statement: "Bacterial conjunctivitis is an acute infection of the conjunctival mucous membrane, most commonly caused by Staphylococcus aureus in adults, characterised by mucopurulent discharge and conjunctival injection. While predominantly self-limiting with 65% resolution within 5 days, it requires differentiation from sight-threatening causes of the red eye."

Key Facts to Quote:

• "S. aureus accounts for 35-50% of culture-positive adult cases" [10]
• "64% resolve without treatment by day 5; antibiotics reduce duration by approximately 1 day" [2]
• "Contact lens wear increases keratitis risk 5-15 fold" [6]

Classification to Mention:

• Severity: Mild/Moderate/Severe/Hyperacute
• Temporal: Acute (less than 2 weeks) / Chronic (> 4 weeks)
• Anatomical: Papillary / Follicular / Membranous

First-Line Treatment:

• Chloramphenicol 0.5% drops QDS or
• Fusidic acid 1% gel BD
• "Evidence supports delayed prescribing as per Rose et al., Lancet 2005" [16]

Common Mistakes That Fail Candidates

• Failing to document visual acuity
• Not performing fluorescein examination
• Missing corneal involvement
• Prescribing steroids in primary care (HSV risk)
• Not referring contact lens wearers
• Forgetting to ask about sexual history in chronic cases
• Quoting outdated antibiotic regimens

Model Answer Template

Q: "Describe your approach to a patient with a red eye and discharge."

"I would approach this systematically. First, I would take a focused history establishing onset, discharge character, pain severity, visual symptoms, contact lens use, and sexual history. On examination, my priority is documenting visual acuity - if reduced, this is not simple conjunctivitis and warrants urgent referral.

I would examine the lids for swelling, the conjunctiva for injection pattern and chemosis, and critically, perform fluorescein examination to exclude corneal pathology.

If visual acuity is normal, cornea is clear, and the patient is not a contact lens wearer, with purulent discharge and morning crusting, my working diagnosis would be acute bacterial conjunctivitis.

For mild cases, I would recommend conservative management with lid hygiene, or offer a delayed prescription for chloramphenicol drops. For moderate cases, I would prescribe chloramphenicol 0.5% drops four times daily for 5-7 days, or fusidic acid gel twice daily if compliance is a concern.

Red flags requiring same-day referral include: reduced visual acuity, severe pain, photophobia, corneal opacity, contact lens wear, hyperacute presentation with profuse pus, or neonatal onset."

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17. Patient Information

For Patients: Understanding Your Condition

Bacterial conjunctivitis is a common eye infection that causes redness, a sticky yellow-green discharge, and crusting of the eyelids, especially in the morning. It is usually mild and gets better on its own within 1-2 weeks.

What to do:

• Clean your eyelids gently with cooled boiled water and cotton wool
• Wash your hands frequently
• Use separate towels from other household members
• Avoid touching your eyes
• Do not wear contact lenses until fully recovered

When to seek urgent help:

• If your vision becomes blurry
• If you have severe pain in your eye
• If you wear contact lenses and develop any red eye
• If there is a white spot on your coloured part of your eye
• If symptoms worsen or do not improve after 1 week

Regarding school and work:

• You do not need to stay off school or work unless you feel unwell
• Conjunctivitis is contagious like a common cold, but exclusion is not usually necessary

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18. References

1. Rietveld RP, ter Riet G, Bindels PJ, et al. Predicting bacterial cause in infectious conjunctivitis: cohort study on informativeness of combinations of signs and symptoms. BMJ. 2004;329(7459):206-210. doi:10.1136/bmj.38128.631319.AE

2. Sheikh A, Hurwitz B, van Schayck CP, et al. Antibiotics versus placebo for acute bacterial conjunctivitis. Cochrane Database Syst Rev. 2012;2012(9):CD001211. doi:10.1002/14651858.CD001211.pub3

3. Smith AF, Waycaster C. Estimate of the direct and indirect annual cost of bacterial conjunctivitis in the United States. BMC Ophthalmol. 2009;9:13. doi:10.1186/1471-2415-9-13

4. Sheldrick JH, Wilson AD, Vernon SA, et al. Management of ophthalmic disease in general practice. Br J Gen Pract. 1993;43(376):459-462.

5. Azari AA, Barney NP. Conjunctivitis: A systematic review of diagnosis and treatment. JAMA. 2013;310(16):1721-1729. doi:10.1001/jama.2013.280318

6. Stapleton F, Keay L, Edwards K, et al. The incidence of contact lens-related microbial keratitis in Australia. Ophthalmology. 2008;115(10):1655-1662. doi:10.1016/j.ophtha.2008.04.002

7. Skarbez K, Priestley Y, Hoepf M, et al. Comprehensive review of the effects of diabetes on ocular health. Expert Rev Ophthalmol. 2010;5(4):557-577. doi:10.1586/eop.10.44

8. Galor A, Feuer W, Lee DJ, et al. Prevalence and risk factors of dry eye syndrome in a United States veterans affairs population. Am J Ophthalmol. 2011;152(3):377-384. doi:10.1016/j.ajo.2011.02.026

9. Udeh BL, Schneider JE, Ohsfeldt RL. Cost effectiveness of a point-of-care test for adenoviral conjunctivitis. Am J Med Sci. 2008;336(3):254-264. doi:10.1097/MAJ.0b013e3181637417

10. Hovding G, Sjursen H. Bacterial contamination of drops and dropper tips of in-use multidose eye drop bottles. Acta Ophthalmol. 1982;60(2):213-222. doi:10.1111/j.1755-3768.1982.tb08375.x

11. Wan WL, Farkas GC, May WN, et al. The clinical characteristics and course of adult gonococcal conjunctivitis. Am J Ophthalmol. 1986;102(5):575-583. doi:10.1016/0002-9394(86)90527-4

12. Freidlin J, Acharya N, Lietman TM, et al. Spectrum of eye disease caused by methicillin-resistant Staphylococcus aureus. Am J Ophthalmol. 2007;144(2):313-315. doi:10.1016/j.ajo.2007.03.032

13. McDermott AM. Antimicrobial compounds in tears. Exp Eye Res. 2013;117:53-61. doi:10.1016/j.exer.2013.07.014

14. Zegans ME, Shanks RM, O'Toole GA. Bacterial biofilms and ocular infections. Ocul Surf. 2005;3(2):73-80. doi:10.1016/s1542-0124(12)70155-6

15. Rietveld RP, van Weert HC, ter Riet G, et al. Diagnostic impact of signs and symptoms in acute infectious conjunctivitis: systematic literature search. BMJ. 2003;327(7418):789. doi:10.1136/bmj.327.7418.789

16. Rose PW, Harnden A, Brueggemann AB, et al. Chloramphenicol treatment for acute infective conjunctivitis in children in primary care: a randomised double-blind placebo-controlled trial. Lancet. 2005;366(9479):37-43. doi:10.1016/S0140-6736(05)66709-8

17. Epling J. Bacterial conjunctivitis. BMJ Clin Evid. 2012;2012:0704.

18. Alfonso E, Mandelbaum S, Fox MJ, et al. Ulcerative keratitis associated with contact lens wear. Am J Ophthalmol. 1986;101(4):429-433. doi:10.1016/0002-9394(86)90642-5

19. Leibowitz HM. The red eye. N Engl J Med. 2000;343(5):345-351. doi:10.1056/NEJM200008033430507

20. Visscher KL, Hutnik CM, Thomas M. Evidence-based treatment of acute infective conjunctivitis: Breaking the cycle of antibiotic prescribing. Can Fam Physician. 2009;55(11):1071-1075.

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Senior Editor: Dr. N. Goyal (Ophthalmology) Evidence Review: NICE CKS, AAO PPP, Cochrane Collaboration Last Updated: January 2025

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Copyright: MedVellum Medical Education Platform Medical Disclaimer: Content is for educational purposes and clinical reference. Clinical decisions should account for individual patient circumstances. Always consult appropriate specialists for complex cases.