Ophthalmic Conjunctivitis
What is Ophthalmic Conjunctivitis?
Ophthalmic conjunctivitis, commonly called “pink eye,” is an inflammation of the conjunctiva—the thin, transparent tissue that lines the inner surface of the eyelids and covers the white part of the eye (sclera). When the conjunctiva becomes irritated, it becomes red, swollen, and may produce a discharge. Conjunctivitis can affect one eye or both and is one of the most frequent eye conditions seen in primary‑care and urgent‑care settings.
The condition is usually benign and self‑limited, but certain forms can lead to complications such as corneal ulcers or vision loss if not treated promptly. Understanding the underlying cause is essential for selecting appropriate therapy and preventing spread to others.
Common Causes
Conjunctivitis can be triggered by infectious agents, allergens, irritants, or systemic disease. The most common causes are:
- Viral infection – Adenoviruses are the leading culprits, but herpes simplex virus (HSV) and varicella‑zoster can also cause it.
- Bacterial infection – Typical organisms include Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. In neonates, Neisseria gonorrhoeae or Chlamydia trachomatis are important considerations.
- Allergic reactions – Seasonal pollen, pet dander, dust mites, and cosmetics can trigger an IgE‑mediated response.
- Irritant (chemical) exposure – Smoke, chlorine, fumes, or accidental contact with cleaning agents.
- Contact‑lens related conjunctivitis – Poor lens hygiene can introduce bacteria or cause a mechanical irritation.
- Dry‑eye associated conjunctivitis – Insufficient tear film leads to inflammation.
- Autoimmune disease – Conditions such as Stevens‑Johnson syndrome, ocular rosacea, or ocular involvement in rheumatoid arthritis.
- Systemic infections – Measles, rubella, or scarlet fever may present with conjunctival inflammation.
- Neonatal ophthalmia – Acquired during delivery from maternal genital flora.
- Drug‑induced – Certain topical ophthalmic medications (e.g., preserved eye drops) or systemic drugs can cause a hypersensitivity reaction.
Associated Symptoms
While redness is the hallmark, conjunctivitis often presents with a constellation of other signs:
- Watery, mucoid, or purulent discharge (depends on cause)
- Itching or burning sensation (especially allergic)
- Foreign‑body feeling
- Crusting of the eyelids, especially after sleep
- Photophobia (light sensitivity) – more common with viral or bacterial forms
- Lacrimation (excess tearing)
- Swollen eyelids (edema)
- Swollen lymph nodes near the ear (pre‑auricular) in viral cases
When to See a Doctor
Most cases of conjunctivitis are mild and improve with basic care, but certain situations warrant professional evaluation:
- Symptoms persist longer than 7–10 days despite home treatment.
- Severe pain, blurred vision, or noticeable decrease in visual acuity.
- Intense photophobia or a feeling of "grittiness" that does not improve.
- Thick, green or yellow discharge suggestive of bacterial infection.
- History of recent eye trauma, surgery, or contact‑lens wear.
- Neonates with redness, swelling, or discharge (risk of serious infection).
- Presence of fever, sore throat, or respiratory symptoms that may indicate viral spread.
- Known immune compromise (e.g., HIV, chemotherapy) where infection can progress rapidly.
Diagnosis
Diagnosis is primarily clinical, based on history and physical examination. The typical steps include:
- History taking – Onset, duration, exposure to sick contacts, allergens, recent travel, contact‑lens use, and systemic symptoms.
- Visual acuity test – To rule out corneal involvement.
- External eye examination – Using a slit‑lamp or ophthalmoscope to assess redness pattern, discharge type, and presence of follicles, papillae, or membrane.
- Fluorescein staining – Detects corneal abrasions or ulceration (bright green staining).
- Laboratory testing (when indicated)
- Conjunctival swab for bacterial culture and sensitivity.
- PCR testing for viral agents (adenovirus, HSV).
- Allergy testing if an allergic component is suspected.
- Special considerations for neonates – Gram stain and culture for gonorrhea or chlamydia.
Treatment Options
Treatment is guided by the identified cause. Below are the main therapeutic categories.
1. Viral Conjunctivitis
- Supportive care: cool compresses, artificial tears, and strict hand hygiene.
- Antiviral therapy (e.g., topical trifluridine or oral acyclovir) only for HSV or varicella‑zoster involvement.
- Isolation for 24–48 hours after onset to limit spread (especially adenovirus).
2. Bacterial Conjunctivitis
- Topical antibiotics (e.g., erythromycin ointment, fluoroquinolone drops such as moxifloxacin). Note: Most mild cases resolve spontaneously, but antibiotics shorten duration and reduce contagion.
- Oral antibiotics may be required for serious infections (e.g., gonococcal conjunctivitis).
3. Allergic Conjunctivitis
- Cold compresses and preservative‑free artificial tears.
- Topical antihistamines/mast‑cell stabilizers (e.g., olopatadine, ketotifen).
- Short‑course topical corticosteroids for severe inflammation (prescribed by an ophthalmologist).
- Avoidance of identified allergens and use of air filters.
4. Irritant‑Related Conjunctivitis
- Immediately flush the eye with sterile saline or clean water.
- Avoid further exposure and use lubricating drops.
5. Contact‑Lens Associated Conjunctivitis
- Discontinue lens wear until the eye clears.
- Proper lens cleaning, replacement schedule, and use of daily‑disposable lenses when appropriate.
- Topical antibiotics if bacterial infection is confirmed.
Home Care Measures (All Types)
- Wash hands frequently and avoid touching the eyes.
- Use a clean washcloth for each eye; change pillowcases daily.
- Do not share towels, cosmetics, or eye drops.
- Apply warm (bacterial) or cool (viral/allergic) compresses for 5‑10 minutes, several times a day.
- Discard any eye makeup used during the episode.
Prevention Tips
- Hand hygiene: Wash hands with soap and water for at least 20 seconds before and after touching the eyes.
- Contact‑lens safety: Follow the wear schedule, clean with recommended solutions, and replace lenses as directed.
- Avoid sharing personal items: Towels, makeup, eye drops, and pillowcases.
- Environmental control: Use humidifiers in dry climates, keep indoor air free of smoke and strong chemicals.
- Allergy management: Keep windows closed during high pollen counts, use HEPA filters, and take prophylactic antihistamines if advised.
- Vaccination: Stay up to date on measles, rubella, and varicella vaccines, which can prevent associated conjunctivitis.
- Neonatal care: Prophylactic erythromycin ointment is routinely applied to newborns in many countries to prevent gonococcal ophthalmia.
Emergency Warning Signs
Seek immediate medical attention if you experience any of the following:
- Sudden loss of vision or severe vision blurring.
- Intense eye pain that does not improve with over‑the‑counter pain relievers.
- Rapidly increasing redness that spreads to the entire eye (possible orbital cellulitis).
- Photophobia accompanied by a gritty sensation and watery discharge—possible corneal ulcer.
- Pus that is thick, green, or bloody, especially in a newborn.
- Fever above 101 °F (38.3 °C) with eye redness in an adult.
- Swelling of the eyelids that prevents the eye from opening.
- History of recent eye surgery or trauma with new redness or discharge.
Key Take‑aways
Ophthalmic conjunctivitis is usually a minor, self‑limiting condition, but it can signal more serious infections or allergic disease. Accurate identification of the cause enables targeted treatment, protects vision, and reduces transmission. Prompt medical evaluation is essential when pain, visual changes, or severe discharge occur.
References:
- Mayo Clinic. “Conjunctivitis (Pink Eye).” https://www.mayoclinic.org
- Centers for Disease Control and Prevention. “Allergic Conjunctivitis.” https://www.cdc.gov
- National Eye Institute (NEI). “Conjunctivitis.” https://www.nei.nih.gov
- World Health Organization. “Eye Care: Preventing Blindness.” https://www.who.int
- Cleveland Clinic. “Eye Infections.” https://my.clevelandclinic.org
- American Academy of Ophthalmology. “Conjunctivitis.” https://www.aao.org