Entropion is an inward turning of the eyelid margin. It may affect one or both eyelids and more commonly involves the lower eyelid.
Clinical features:
(1) inward turning of the eyelid margin
(2) ocular irritation with a foreign body sensation
(3) corneal damage
Causes:
(1) congenital (present at birth)
(2) scarring (cicatricial)
(3) muscle spasm (orbicularis)
(4) involutional (none of the above present, usually with horizontal lid laxity)
