Eyelid evaginate is to issue eyelid conjunctiva to retroflexion outwards, send eyelid and eyeball to cannot be contacted closely, eyelid is cracked close not complete. Because evaginate hind is exposed for a long time and eyelid conjunctiva easy happening chronic conjunctivitis, cause secretion increase, combinative film dry, fleshy congests. Go up eyelid evaginate, because cornea exposes easy intercurrent keratitis and cornea traumatic, make eyesight drops, even blindness. Issue eyelid evaginate, because the tear is nodded cannot as clingy as eyeball, send produce excessive tear. Even if longitudinal eyelid evaginate, the function is damaged not heavy, also because of the exterior not beautiful and need is correctional. Eyelid evaginate produces a reason to be able to be divided by its for scar sex, paralytic sex, senile sex, convulsion sex 4 kinds. The sort of the operation is more, can divide roughly shrink to seam law, leather valve law, skin-grafting law. Former apply to law of valve of skin of; of longitudinal eyelid evaginate to apply to latter of heavier eyelid evaginate; to apply in evaginate of scar sex eyelid most.