Some patients with hyperthyroidism develop a number of ocular signs: receding upper lids, protruding eyeballs, ocular motility disorders, exposure keratitis, and decreased visual acuity. One of the more common is eyelid recession. What is eyelid retraction? When a patient is looking straight ahead, the upper or lower lid margin exceeds its normal position, resulting in exposure of the upper and lower corneal margins or sclera. In a normal person, the upper lid covers the upper cornea by 1.5 to 2 mm when looking straight ahead, and the lower lid margin is positioned at approximately the same level as the corneal margin. Eyelid recession is the most common clinical manifestation of thyroid-related ophthalmopathy and can cause dry eye. We also screen patients for thyroid function tests, and if there are any abnormalities, they should be treated medically first and surgery should be considered after 6 months to 1 year of stabilization. If the patient requires orbital decompression or oculomotor surgery, the eyelid retraction surgery is performed after these two procedures. The main principle of surgery is lengthening of the levator muscle. The procedure varies depending on the degree of regression: in mild cases, Muller muscle resection is performed. In severe cases, lengthening of the levator muscle and posterior migration are performed. In cases of lower lid retraction, a posterior migration of the lower lid retractor muscle or a combined MEDPOR filling is performed.