The main effects of diabetes on the eyes are: (1) It affects the healing of the wound after excimer laser surgery. (2) It is prone to infection after surgery. (3) Diabetic patients often have complications of diabetic retinopathy and are prone to complications of the fundus during surgery. However, excimer laser surgery is also acceptable after blood sugar control. Before surgery, detailed examination of the fundus should be performed, and excimer laser surgery should be considered after treatment if there are fundus complications, and patients with proliferative diabetic retinopathy cannot receive excimer laser surgery treatment.