I think I have pink eye: what should I know?

Pink eye is commonly conjunctivitis, an inflammation of the eye surface that may cause redness, discharge, irritation or watering. Several causes can produce similar symptoms, so eye pain, vision change or marked light sensitivity should not be self-diagnosed as simple conjunctivitis.

Conjunctivitis may affect one or both eyes. You might notice Red Eye, gritty discomfort, watering or Eye Discharge that crusts on the lashes. Viral, bacterial and allergic causes can behave differently, and irritation from contact lenses, cosmetics or chemicals may need a different response. Light Sensitivity, significant pain or reduced vision is less typical of uncomplicated surface irritation and needs assessment.

Wash hands before and after touching the face, avoid rubbing the eyes, and do not share towels, pillows, cosmetics or eye drops. Clean discharge gently with clean water and a fresh pad for each eye. Stop wearing contact lenses until symptoms have cleared and a clinician says it is safe to restart; replace lenses or cases if advised. Arrange a GP Consultation if symptoms are persistent, recurrent or unclear. Antibiotic Treatment helps only selected bacterial infections and should not be used without an appropriate assessment.

Seek urgent eye care for severe pain, reduced or blurred vision, strong Light Sensitivity, injury, chemical exposure, a pronounced one-sided change, or swelling around the eye. Contact-lens wearers should seek prompt advice for a painful red eye because corneal infection can threaten vision. Emergency help is needed if vision is suddenly lost or the eye has been penetrated.

Does this look infectious, allergic or irritant? Do I need a swab or treatment? How long should I avoid contact lenses and close contact? Which symptoms mean I should return urgently?