Entropion is a condition where the eyelid margin is turned inward with the eyelashes against the corneal surface. Involutional entropion results from laxity or disinsertion of the lower eyelid retractors.  In catricial entropion the conjunctival surface is scarred or contracted from trauma or diseases such as trachoma or cicatricial ocular pemphigoid. With eyelashes rubbing against the cornea, patients present with ocular irritation, tearing, or corneal scarring. Repair is achieved with retractor reinsertion or mucous membrane grafting to lengthen the posterior lamella.