Answer:
Ectropion is an outward turning or eversion of the eyelid, which like entropion, can be categorized as congenital or acquired, the latter being further categorized as cicatricial, involutional (aging), complex, or paralytic.
Correction of involutional ectropion involves correction of medial lid ectropion, which if moderate, requires excision of a diamond-shaped portion of the retrocanalicular tarsus and conjunctiva, and suture placement to shorten the lid vertically. In more severe cases, a lazy-T incision is made and a triangle of excess tissue is excised to correct both the horizontal and vertical component. In more severe cases, the lazy-T incision needs to be combined with lateral canthal tightening and lid shortening.
Paralytic ectropion is caused by facial nerve palsy, resulting in denervation of the orbicularis oculi muscle. Surgical correction requires a levator exploration.