Double vision may be caused by astigmatism, strabismus, or lens subluxation. Patients can be treated with glasses to correct astigmatism and surgical treatment to improve discomfort symptoms. If the patient has double vision in one eye, it may be caused by astigmatism or subluxation of the lens. The patient can correct the astigmatism by wearing glasses and correct the subluxation of the lens by surgical treatment, so as to improve the symptoms of eye discomfort. If the patient has double vision, it is mostly caused by strabismus, and the patient can wear a prism to correct the small degree of strabismus. If the patient has a large degree of strabismus, surgical treatment, such as medial rectus muscle reduction, can be performed to balance the eye position and improve the discomfort. Patients with double vision are advised to seek medical attention to evaluate their condition and follow the doctor’s instructions.