Procedures for congenital ptosis depends on the function of the levator muscle. Most congenital cases have severe muscle weakness(less than 3mm of function tested by moving the upper eye lid upwards).
In these cases, levator resection will not work well because the "motor" which is the levator muscle is not working properly.
The procedure in this case is a frontalis sling procedure. This procedure relies on the frontalis muscle to act as an upper lid elevator.
Hope that helps!



