Analysis of the Causes of Ptosis

The authors reviewed the patient's charts of 300 patients with ptosis(401 eyes). The patients were classified into congenital and acquired and analyzed patients according to causes and their incidences. Of all patients, 261(86%) were congenital ptosis and the remaining 39 were acquired. The most common type of convenital ptosis was simple one(85%). On the other hand, acquired ptosis composed of mechanical(35.9%) and traumatic (23.1 %) in their incidence. In regarding severity of ptosis, severe form were 72% and 45% in congenital and acquired, respectively. When compared with reports from other countries on their incidence, congenital ptosis was much higher than that of incidence.