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Frequent presentation in general practice. Conjuctiva is red and inflamed, eyes itch, burn and lacrimate, possible photophobia. Cause may be viral bacterial or allergic. Often bilateral; if unilateral consider other causes

Allergic Both eyes affected. Caused by contact with an allergen, eg, animal dander. May be seasonal, as in hay fever (pollen allergy)

Infective (viral or bacterial) Usually starts in one eye and then spreads to both.

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