Microscopic and ultrastructural changes of Müller's muscle in patients with simple congenital ptosis.

Purpose: To study microscopic and ultrastructural changes of Müller's muscle in patients with isolated congenital ptosis.

Methods: In this prospective, observational case-control study, Müller's muscle specimens were collected during ptosis surgical correction for 18 consecutive patients. Each specimen was divided into 2 parts.

Unilateral eyelid lag and retraction as sequelae of trachoma.

A 42-year-old woman had a large right palpebral fissure 13 mm high with 0.5 mm of scleral show both superiorly and inferiorly due to upper and lower eyelid retraction. The upper eyelid showed eyelid lag behind the globe only during the initial ocular movement.