There are many causes of blurred eyes, and the treatment for different diseases is different. Common diseases that cause vision loss include the following: First, refractive error, including myopia, hyperopia or astigmatism. For this disease, glasses can be worn to improve vision. Second, amblyopia. This is a disease that is more common in children or infants, and is caused by the presence of certain occlusive factors in the eyes, resulting in impaired vision development. This disease must be detected and treated as early as possible. If effective treatment is given during the critical period of vision development, it is possible to recover, but it is difficult to recover if this period is missed. Third, cataract, which is a relatively common disease in the elderly. If it is serious, surgery can be performed to improve vision. Fourthly, fundus diseases, such as vitreous hemorrhage, retinal detachment, macular edema, macular membrane, macular fissure, etc., this depends on the results of the specific examination to decide how to treat.