How common is red eye in conjunctivitis?

Conjunctivitis is irritation or inflammation of the thin tissue covering the white of the eye and lining the eyelid. Blood vessels in that tissue become more visible, giving the eye a pink or red appearance. There may also be watering, grittiness, itching, discharge, or eyelids that stick together after sleep. The pattern can differ with allergy, infection, irritants, or contact-lens related problems.

Redness alone does not identify the cause. A careful history of discomfort, discharge, vision changes, contact-lens use, and exposure to irritants helps a clinician distinguish conjunctivitis from other eye conditions.

Avoid rubbing the eye, wash hands after touching the face, and do not share towels, eye cosmetics, or contact-lens cases. A clean cool compress may soothe irritation. Stop wearing contact lenses until the eye is comfortable and a clinician has advised when they can be used again. Do not use someone else’s eye drops or leftover prescription drops.

If discharge is present, gently clean the eyelids with clean water and a fresh cloth. Replace eye makeup used around the time symptoms began, particularly if infection is suspected.

Seek urgent medical assessment for eye pain, marked light sensitivity, reduced or changed vision, a severe headache with nausea, injury, or a chemical splash. Contact-lens wearers with a red, painful eye should be assessed promptly because the cornea may be involved. Arrange non-urgent care if symptoms are worsening, recurring, or not settling, especially when discharge or eyelid swelling is troublesome.

You could ask whether your symptoms fit conjunctivitis, whether allergy or an irritant is likely, and whether any eye drops are appropriate. Mention contact-lens wear, a recent eye injury, new cosmetics, affected household members, and any change in vision.