Patients with double vision may have refractive errors, strabismus, or other disorders, and this type of double vision is not self-correcting. Visual fatigue can also occur in patients with double vision, which can usually be cured by relaxing the eyes. When double vision occurs, first determine whether it is monocular or binocular, if it is monocular double vision, consider that it is caused by ocular factors, such as myopia, hyperopia, astigmatism, etc., the possibility of self-healing is very small, and the patient needs to wear glasses to correct. If the patient has binocular diplopia, that is, double vision, it may be caused by strabismus, because the eye position is skewed and thus double vision occurs, which is difficult to be cured on its own. In addition, patients with visual fatigue may also experience discomfort such as double vision, photophobia and tearing, which can be relieved after resting with eyes closed. Patients with prolonged double vision are advised to consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.