Red eyes are caused when the small blood vessels on the surface of the eye become enlarged and congested with blood. This occurs as a result of insufficient oxygen supply to the cornea or the tissues covering the eyes. Usually, red eyes are not really a cause for major concern but if eye pain or impaired... 

Allergic conjunctivitis (pink eyes) is a reaction to exposure to allergens such as pollen from grasses and trees, smoke, dust or chemicals. It is characterized by redness, itching, swelling of the clear tissue covering the white of the eye (conjunctiva) and watery discharge. The treatment of allergic...