Conjunctivitis is an inflammation of the conjunctiva, the mucous membrane that lines the eyelids layers, the front of the eyeball and the fornix of the eye. Its basic function is to protect the surfaces lining, so when an infection in the same occurs, it tends to swell. The most common symptoms of conjunctivitis are redness, burning and strange sensation in the eye, as well as the appearance of yellow or green mucus, especially in the eyelashes. These symptoms also occur frequently in cases of allergy. Treatment for conjunctivitis includes application of eye drops or gel, plus a thorough cleaning of the area with sterile physiological saline or warm water boiled.