Conjunctivitis is an inflammation of the thin clear membrane (conjunctiva) that covers the white of the eye and inside surface of the eyelid. It can be caused by a variety of bacteria, viruses and other germs as well as by allergy (e.g. pollens) and exposure to chemicals (e.g. smoke, cosmetics) or irritants (e.g. dust).
Infection spreads from person to person by direct contact, in droplets coughed or sneezed into the air, or on hands, towels and washcloths. The time until illness begins depends on the germ involved but is usually 2 to 7 days after exposure.
