The timing of surgery for congenital ptosis is based on postoperative results and the child’s visual development. In general, if the upper lid does not completely obscure the pupil area, the child can see in a compensatory head position and this does not affect the development of vision, surgery can be considered after the age of four. Otherwise, surgery can be performed as early as possible after the age of one. This is because monocular children still have one eye that can be used normally, so there is no need to compensate for the head position, which will inevitably affect the visual development of the affected eye. 3. The recurrence rate after surgery is high, usually in the teenage years, and can be treated by surgery again.