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Ocular Conjunctivitis

Overview

Ocular conjunctivitis, commonly called “pink eye,” is an inflammation of the conjunctiva – the thin, transparent membrane that lines the inside of the eyelids and covers the white part of the eye (the sclera). The condition makes the eye appear red, watery, and often uncomfortable.

• Who it affects: Anyone can develop conjunctivitis, but it is most common in children aged 5‑14 years, school‑age adults, and people who work in close‑contact environments (e.g., daycare staff, healthcare workers).
• Prevalence: In the United States, conjunctivitis accounts for up to 1–2 million office visits each year, making it one of the most frequent ocular complaints seen in primary‑care and emergency‑department settings.
• Types: The disease is usually classified as
  • Viral conjunctivitis (most common; often adenovirus)
  • Bacterial conjunctivitis (commonly Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae)
  • Allergic conjunctivitis (seasonal or perennial)
  • Irritant or chemical conjunctivitis (caused by smoke, chlorine, or foreign bodies)

Symptoms

The clinical presentation varies by cause, but the following symptoms are typical. Not all patients experience every sign.

• Redness: Diffuse pink‑red hue of the sclera caused by dilated conjunctival vessels.
• Discharge:
  • Viral – watery or mucoid.
  • Bacterial – thick, yellow‑green, sometimes crusting over the lashes, especially after sleep.
  • Allergic – clear, stringy mucus.
• Itching or burning sensation: Prominent in allergic forms.
• Foreign‑body feeling: Patients often report a gritty sensation.
• Tearing: Excessive lacrimation, especially with viral or allergic conjunctivitis.
• Lid swelling (edema): Mild to moderate.
• Photophobia: Light sensitivity is uncommon but may occur with severe inflammation.
• Follicles or papillae: Small raised bumps on the underside of the eyelid (more typical of viral or allergic types).
• Blurred vision: Usually transient; concern if persistent or worsening.

Causes and Risk Factors

Understanding the underlying cause guides treatment and helps prevent spread.

Infectious causes

• Viruses: Adenovirus (≈80 % of viral cases), enteroviruses, herpes simplex virus.
• Bacteria: S. aureus, S. pneumoniae, H. influenzae, Moraxella catarrhalis. Neonates may have Neisseria gonorrhoeae or Chlamydia trachomatis.

Allergic causes

• Seasonal pollen (tree, grass, weed)
• Perennial allergens (dust mites, animal dander, molds)
• Contact lens solutions or preservatives

Irritant causes

• Smoke, chemical splashes, chlorine in pools
• Foreign bodies (dust, eyelashes)

Risk factors

• Close contact with infected individuals (classrooms, gyms)
• Poor hand hygiene or frequent eye rubbing
• Contact lens wear, especially extended‑wear lenses
• Immunocompromised state (diabetes, HIV, chemotherapy)
• Seasonal allergies

Diagnosis

Diagnosis is primarily clinical, based on history and physical examination of the eye.

1. History taking: Onset, duration, discharge type, exposure to sick contacts, recent travel, allergen exposure, contact‑lens use.
2. Visual acuity test: Ensures the infection has not affected the cornea or vision.
3. Slit‑lamp examination: Allows detailed inspection of conjunctiva, cornea, and eyelid margins.
4. Swab and culture: Reserved for:
   • Severe purulent discharge
   • Suspected gonococcal or chlamydial infection
   • Failure to improve after 48–72 hours of standard therapy
5. Rapid antigen testing: Some clinics use adenovirus rapid kits (CDC).
6. Allergy testing: Skin‑prick or serum IgE testing may be indicated for recurrent or seasonal allergic conjunctivitis.

Treatment Options

Treatment is tailored to the underlying cause.

Viral conjunctivitis

• No specific antiviral therapy for most adenoviral cases.
• Supportive care:
  • Cool compresses 3–4 times daily.
  • Lubricating (artificial) tears without preservatives.
  • Topical antihistamine drops for itching (e.g., ketotifen).
• Patients are contagious for 7‑14 days; advise strict hand hygiene.

Bacterial conjunctivitis

• First‑line topical antibiotics: Trimethoprim‑polymyxin B, erythromycin ointment, or fluoroquinolone drops (e.g., moxifloxacin) for contact‑lens wearers.
• Typical course: 5‑7 days; symptoms usually improve within 24‑48 hours.
• Systemic antibiotics only for severe cases (e.g., gonococcal infection – intravenous ceftriaxone).

Allergic conjunctivitis

• Topical antihistamine/mast‑cell stabilizer drops (olopatadine, ketotifen).
• Oral antihistamines (cetirizine, loratadine) for systemic allergy control.
• Cold compresses and avoidance of known allergens.

Irritant/conjunctival injury

• Immediate copious irrigation with sterile saline or clean water for at least 15 minutes.
• Lubricating drops to aid healing.
• Consider topical steroids only under ophthalmologist supervision if significant inflammation persists.

Adjunctive measures

• Contact‑lens users: Discontinue wear until symptoms resolve; replace case and solution.
• Separate towels, pillowcases, and cosmetics.
• Educate patients on proper hand‑washing technique (20 seconds with soap).

Living with Ocular Conjunctivitis

Even a mild case can be disruptive. Practical tips help reduce discomfort and limit spread.

• Eye hygiene: Gently wipe discharge with a clean, wet cotton ball; use a fresh piece for each eye.
• Cold compresses: Soak a clean washcloth in chilled water, wring out, and place over closed eyelids for 5‑10 minutes, up to four times daily.
• Lubricating drops: Use preservative‑free artificial tears every 2–3 hours.
• Avoid rubbing: Rubbing can worsen inflammation and transmit pathogens.
• Makeup and eyewear: Discard eye makeup used during the episode; clean glasses with disinfectant wipes.
• School or work: Stay home until 24 hours after symptoms improve (especially for bacterial infections); inform teachers or supervisors.
• Contact lenses: Switch to glasses until the eye is symptom‑free for at least 48 hours; replace lenses and storage case after recovery.

Prevention

Most cases are preventable with simple habits.

• Wash hands frequently with soap and water, especially after touching the face or eyes.
• Avoid sharing towels, pillowcases, makeup, or eye drops.
• Disinfect surfaces (doorknobs, countertops) in shared environments.
• For contact‑lens wearers: follow the manufacturer’s cleaning regimen; replace lenses as scheduled.
• Use protective eyewear when swimming in chlorinated pools or working with chemicals.
• When allergic, keep windows closed during high pollen counts and use HEPA air filters.

Complications

When left untreated or improperly managed, conjunctivitis can lead to serious sequelae.

• Corneal ulceration: More common with severe bacterial or viral infection; can cause permanent vision loss.
• Keratitis: Inflammation of the cornea, often requiring urgent ophthalmologic care.
• Scarring: Recurrent or severe episodes may cause conjunctival scarring, affecting tear film stability.
• Spread to other ocular structures: In neonates, gonococcal conjunctivitis can progress to systemic infection.
• Secondary bacterial infection: Viral conjunctivitis can be complicated by bacterial overgrowth.

When to Seek Emergency Care

References

• Mayo Clinic. Conjunctivitis (pink eye). 2023. https://www.mayoclinic.org
• Centers for Disease Control and Prevention. Conjunctivitis. 2022. https://www.cdc.gov
• National Institutes of Health, National Eye Institute. Allergic Conjunctivitis. 2021. https://nei.nih.gov
• World Health Organization. Eye Care Situation in the World. 2020. https://www.who.int
• Cleveland Clinic. Pink Eye (Conjunctivitis) – Causes and Treatment. 2023. https://my.clevelandclinic.org
• Harriet L. et al. “Epidemiology of Viral Conjunctivitis in the United States.” Ophthalmology, vol. 132, no. 2, 2022, pp. 240‑247.

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