Conjunctivitis symptoms in adults: what to know

In adults, conjunctivitis can start after a respiratory illness, contact with an affected person, exposure to an allergen, or irritation from smoke, dust or chemicals. The eye surface may become red and watery, with a gritty sensation, itch or burning. Discharge can dry on the lashes, particularly after sleep. One eye may be affected first. Viral, bacterial, allergic and irritant causes overlap in appearance, so adult symptoms do not by themselves identify the cause or determine whether antibiotics are useful.

Most adults with conjunctivitis notice eye-surface symptoms such as redness, watering or discharge; marked pain, persistent vision change or strong light sensitivity calls for a different level of assessment.

Clean the eyelids gently with clean water and a fresh pad, wash hands regularly, and avoid rubbing the eyes. Do not share towels, pillows, cosmetics or drops. Remove contact lenses and avoid wearing them until symptoms have cleared and a clinician advises that they can be restarted. Cool compresses may reduce irritation, while suitable lubricating drops may ease dryness. A GP consultation is useful when the cause is unclear or symptoms interfere with work and daily tasks. Antibiotic treatment should be used only when a clinician considers it appropriate.

Seek urgent assessment for severe or deep eye pain, reduced vision, intense light sensitivity, an injury, chemical exposure, or marked swelling. If you wear contact lenses and develop a painful red eye, obtain prompt medical advice. Book a review when symptoms are worsening, persistent, recurrent, or accompanied by unusual discharge. Avoid driving if vision remains blurred after cleaning and blinking.

Tell the clinician when symptoms began, whether one or both eyes are involved, whether you wear lenses, and whether there has been illness, allergy or chemical exposure. Ask when work, swimming, lenses and makeup can safely resume.