Abnormal eyelid morphology Entropion Eyelid folded in The inward turned eyelid margin increases the potential for mechanical irritation of the eye by eyelashes. Entropion is to be distinguished from epiblepharon. HP:0000621 SNOMEDCT_US:33168009 UMLS:C0014390 Inverted eyelid An abnormal inversion (turning inward) of the eyelid (usually the lower) towards the globe. Entropion is usually acquired as a result of involutional or cicatricial processes but may occasionally be congenital. Eyelid turned in