Forty-five eyelids of 43 consecutive patients (16 female, 27 males) that underwent levator resection surgery for ptosis correction were included in the study. Twenty-six of the eyelids had congenital ...

Levator maldevelopment (dysmyogenic) ptosis is the most common type of ptosis seen in childhood and is caused by primary dystrophy of the levator muscle. Mueller's superior tarsal muscle is normal.