Blurred vision at medium and long distances, but clear vision at close range, considering visual fatigue, myopia, cataracts and other causes. With the popularization of electronic products in modern society, the time spent staring at the electronic screen is prolonged, which is very easy to cause visual fatigue. When visual fatigue occurs, it will lead to blurring of the eyes in the middle and long distances, sometimes accompanied by dryness of the eyes and other situations. The typical manifestation of myopia is unclear vision at a distance, which is mainly caused by the focus of the incident light falling in front of the retina, and it is recommended to wear eyeglasses after optometry. Cataract is a common disease among the elderly, which causes blurred vision at a distance and clear vision at a near distance, then go to the hospital as soon as possible for consultation and surgery if necessary. If the above situation occurs, you must go to the hospital as soon as possible to clarify the cause, and then for treatment.