Compensating for anesthesia-induced lagophthalmos and adjusting the palpebral fissure increased the predictability of eyelid height after surgery for pediatric congenital ptosis, a study found.

The mean height of the vertical palpebral fissure in patients with congenital ptosis and aponeurotic ptosis were 6.5 mm (range 5–9 mm) and 6.1 mm (3–9 mm), respectively.