Blurred vision may be caused by visual fatigue, refractive error, cataract and other factors, which need to be examined in a specialized eye hospital. 1. Visual fatigue: Long time close reading or long time looking at electronic equipments will cause visual fatigue and blurring of things in the distance. You need to adjust the time and distance of reading books or electronic devices, and look at different things to relieve vision fatigue. 2. Refractive error: Myopia in refractive error is the blurring of things in the distance, so consider whether it is myopia. You need to go to the hospital for vision examination and wear glasses if necessary. 3. Cataract: Age, trauma, congenital, radiation and other factors lead to an increase in the density of the lens, thus causing cataracts, and in the early stage, blurring of things in the distance. In addition to physiological causes of blurring, other causes are recommended to go to the hospital for further examination and accept the doctor’s treatment.