Eyelid muscle weakness mostly refers to ptosis. The cost of ptosis surgery is related to the patient’s specific condition. For mild ptosis, the cost is about $6,000; for severe ptosis, the cost is about $15,000, but the exact cost of the surgery is also related to the hospital’s pricing. Mild ptosis is defined as a condition in which the upper eyelid margin covers the upper edge of the cornea by less than three millimeters when the patient naturally opens their eyes and looks at the cornea when they are looking at a flat surface, when the levator muscle is not functioning properly in either eye. Surgery is not very complicated and can be performed with a frontalis flap or other surgical procedure and is relatively inexpensive, costing around $6,000. In severe cases, the ptosis covers more than one-half of the cornea or all of the cornea, and may partially or completely cover the pupil, which can have a significant impact on vision and visual function. Surgery is more difficult to perform and the procedure of choice is levator surgery, which is also relatively expensive at around $15,000, depending on the hospital’s pricing. It is recommended that patients with ptosis be seen in a timely manner to have their condition evaluated and treated in accordance with their doctor’s instructions, and that they consult their physician for specific treatment costs.