Eye strain, called visual fatigue, is actually not a separate eye disease, but a syndrome. There are many causes of visual fatigue, such as environmental factors, eye factors and systemic factors. Among them, eye factors are common after prolonged close eye use, refractive error patients, it may be caused by wearing inappropriate glasses; some are accompanied by strabismus, or collection function is insufficient to cause visual fatigue, in addition. If the eye surface has various diseases, it can also cause visual fatigue. For example, we should wear appropriate glasses and review them regularly to prevent refractive undercorrection or overcorrection; for patients with insufficient collecting power or external strabismus, we should conduct extraocular muscle training, which aims to improve the coordinated movement of both eyes and can enhance the fusion function; go to the hospital for routine eye examination to exclude blepharitis, chronic conjunctivitis, keratitis, dry eye, supraorbital You can also use eye drops without preservatives to treat visual fatigue.