Conjunctivitis: How Is It Treated?
Also known as: Pink eye, Pinkeye
What Is Conjunctivitis?
Conjunctivitis is an inflammation of the conjunctiva, the thin, clear membrane covering the white of the eye and the inside of the eyelids. It’s one of the most common eye conditions, affecting people of all ages. It can be viral, bacterial, or allergic, with each cause having its own features and requiring different care. While usually mild with a good outlook, infectious conjunctivitis is highly contagious and can spread quickly in group settings.
Causes and Risk Factors
Viral conjunctivitis is the most common type, and it is often linked to a cold or upper respiratory infection. Bacterial conjunctivitis is marked by heavier, pus-like discharge. Allergic conjunctivitis results from exposure to allergens (pollen, dust mites, pet dander) and frequently affects people with an atopic (allergy-prone) background.
Poorly maintained contact lenses and contact with an infected person are additional risk factors. Irritants can also inflame the conjunctiva: chlorine in a swimming pool, smoke, and dust are common ones, though pink eye from an irritant is not contagious. Viral and bacterial conjunctivitis spread easily and move quickly through schools and other crowded settings, which is why avoiding close eye contact with an infected person matters. Allergic conjunctivitis is not contagious.
Symptoms
Common symptoms include eye redness, itching, tearing, and a feeling of discomfort or grit in the eye. Light sensitivity is also common. Discharge varies by cause:
- Viral: clear and watery
- Bacterial: thick and yellow to green, sometimes crusting the eyelids shut overnight
- Allergic: watery tearing rather than pus, often with intense itching
Itching is the hallmark sign of allergic conjunctivitis, and it is typically bilateral, so both eyes are affected at once.
Diagnosis
Diagnosis is mainly clinical, made by a doctor during an eye exam, which helps point to a viral, bacterial, or allergic cause based on the appearance of the discharge, the context, and associated symptoms. Because the symptoms of the three forms overlap a great deal, the exact cause can be genuinely hard to pin down on appearance alone. If there’s diagnostic uncertainty, a severe case, recurrence, or treatment failure, an eye swab or an ophthalmology referral may be needed.
Available Treatments
Treatment depends on the cause identified:
- Supportive care for comfort in all cases: cool or warm compresses and over-the-counter artificial tears
- Antibiotic eye drops or ointment for confirmed bacterial conjunctivitis
- Antihistamines (topical or oral) for allergic conjunctivitis, along with avoiding the trigger where possible
- No specific treatment for viral forms, which usually clear up on their own in 1 to 2 weeks
- Stopping contact lens wear for the entire duration of the infection
Viral conjunctivitis calls for supportive care only, so antibiotic drops do not speed it up and are not the right treatment for it.
Prevention and Practical Tips
Frequent handwashing with soap and water and avoiding touching or rubbing your eyes are the key prevention steps against infectious forms. It’s best not to share towels, washcloths, pillows, or makeup, and to properly care for contact lenses according to the manufacturer’s instructions. After an episode, discard eye makeup and any contact lens supplies used while you were infected. If you have a known allergy, limiting exposure to identified allergens helps reduce how often episodes occur.
When Should You See a Doctor?
Contact a doctor if your symptoms persist beyond 3 to 4 days, or sooner if you have significant eye pain, blurred vision, or very heavy discharge.
Seek care promptly for any of these red flags:
- Moderate to severe eye pain
- Blurry vision or intense sensitivity to light
- Symptoms that keep getting worse instead of improving
- A weakened immune system
- Symptoms while wearing contact lenses
Sources
- MedlinePlus, U.S. National Library of Medicine, conjunctivitis overview
- National Eye Institute (NIH), pink eye causes, treatment, and prevention
- American Academy of Ophthalmology (AAO), patient education on conjunctivitis
- National Eye Institute (NIH), Causes of Pink Eye, infectious causes, allergens, and irritants including swimming pool chlorine
- Conjunctivitis, StatPearls (NCBI Bookshelf, NIH), when an eye culture is indicated and when to refer to ophthalmology
- Allergic Conjunctivitis, StatPearls (NCBI Bookshelf, NIH), itching as the hallmark sign and typical bilateral presentation