Red eye is not contagious after full recovery. Red eye, also called bacterial conjunctivitis, is an inflammation of the conjunctiva caused mainly by bacterial infection, and this disease is contagious, and the mode of infection is mainly by contact. Therefore, in the acute stage of the disease, when there is more secretion, the infection is stronger. If you touch the secretion of the eye with your hand or clothes, it may be contagious by contact or lead to cross infection between two eyes. However, when the disease is cured, the eye discharge is usually gone, so it disappears at this stage and there is no chance of infection. After conjunctivitis is present in the eye, if there is a lot of discharge from the eye, it is necessary to use saline or boric acid lotion to flush the conjunctival sac to keep the eye locally clean so that the chance of contact infection can be reduced. In addition, when rinsing, care should be taken that the rinse solution does not flow into the opposite eye to prevent the appearance of cross infection.