Common sense in the treatment of ptosis is when the upper eyelid covers the upper cornea by more than 2 mm and when the upper eyelid partially or completely covers the visual axis. A detailed preoperative eye and special examination is done to determine the cause and decide on the surgical procedure, especially in children to check the refractive status and determine if amblyopia is already present. Most congenital ptosis is due to poor appearance and needs to be operated on between 3-6 years of age before school. Patients with pre-existing amblyopia need surgery around age 3; those without amblyopia and with mild disease can wait until they are able to undergo local anesthesia before undergoing surgery to correct the condition. Acquired ptosis, such as trauma or neurogenic, can be operated on after six months to a year of stabilization; elderly ptosis can be operated on when it obscures the visual axis or affects the appearance of the eyelid. Patients should follow up regularly after surgery as prescribed by their doctor. They may have incomplete eyelid closure for 3 months or more and should pay attention to applying more eye ointment at bedtime to protect the cornea.