Many people in life will appear to see things blurred and foggy, as if the eyes are covered with a film, and sometimes this phenomenon will appear and then relieve itself. The specific reasons are as follows: 1. Refractive error: most people who wear glasses have had the experience of blurred eye vision before dispensing glasses. Myopia, farsightedness, astigmatism can have blurred eyes. 2, fatigue eye overuse: lack of sleep, overwork, modern society for cell phones, computers, television and other electronic screens frequent, long time use caused by visual fatigue, resulting in blurred eyes. 3, nutrient deficiency: such as vitamin A deficiency can lead to night blindness, vitamin B deficiency may also lead to dry eyes and blurred vision. 4, eye lesions: retinal detachment, cataract and dry eye, glaucoma and other eye diseases can lead to blurred vision. 5, systemic diseases: such as anemia, diabetes, cardiovascular disease, etc. can be complicated by eye diseases that lead to blurred eyes. The blurred eyes should not be taken lightly, it is not just due to fatigue, but may be a sign of a serious disease, such as glaucoma, diabetes, anemia, hypoxia, hypertension, etc. It is recommended to seek timely medical attention and standardized treatment to avoid permanent damage to the eyes.