Ptosis is a condition in which the upper eyelid is partially or completely drooping, partially covering the pupil in mild cases or completely covering the pupil in severe cases. Patients often frown and shrug to improve their vision, and those with bilateral ptosis often look up to see. Ptosis can be classified as congenital or acquired. Congenital: mainly due to hypoplasia of the levator muscle, which is autosomal dominant. Acquired: There is a combination of actinic nerve palsy, upper eyelid injury, sympathetic nerve disease, and myasthenia gravis. The degree of ptosis can be classified as complete ptosis, incomplete ptosis, and pseudo-pituitary ptosis. Diagnosis of ptosis Because of the choice of treatment, the type of ptosis, the cause, the degree of ptosis, and the relationship between the function of the levator muscle and the whole body and other neuromuscles must be carefully examined and differentiated. The examination of ptosis 1, congenital ptosis, acquired ptosis, and pseudohypoptosis are often very different in treatment and must be clearly identified before treatment. To avoid the influence of the frontalis and frowning muscles when the lid is open, the patient should be examined with two thumbs pressing firmly on the arch of the eyebrow before gazing in each direction and recording the height of the lid fissure. If the upper lid cannot be lifted at all, the lid is completely ptotic, while if it can be lifted slightly, the lid is incompletely ptotic. Treatment of congenital ptosis is not effective with medication and should be corrected with early surgery, especially if the pupil is blocked by unilateral ptosis, to prevent amblyopia. The most common surgical methods are levator shortening and frontalis flap suspension.