Bacterial conjunctivitisA red eye with a sticky yellow or yellow/green discharge. Eyelids may be stuck together upon waking. Can affect one or both eyes. Usually spread by direct contact only.
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Allergic conjunctivitisVery similar in appearance to viral conjuntivitis, but accompanied by nasal congestion, sneezing, eyelid swelling and sensitivity to light. Both eyes are affected. Not contagious.
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Normal eyeIn a healthy eye, the sclera is essentially white with only a few small blood vessels visible. There is an adequate tear film, with no significant discharge or watering.
Viral conjunctivitisThe type of conjunctivitis most commonly associated with the term "pink eye." Appearance: red, itchy, watery eye. Can affect one or both eyes. Highly contagious.