There are many reasons why the eyelids may not close during sleep, including trauma, congenital development, and after eye surgery. In mild cases of eyelid closure, only some of the white tissue of the eye is exposed, and the symptoms of the eye, including irritation, will be minimal. However, if more eye tissue is exposed, especially in the area of the exposed black eye, it may cause exposure keratitis, which needs to be treated in an aggressive manner by applying eye ointment once at bedtime. If the application of eye ointment still does not improve, it may be necessary to add gauze wrapped eyes at bedtime each night to ensure that the corneal tissue is protected and does not cause damage to the cornea.