The blurring phenomenon of looking at the cell phone may be caused by visual fatigue, old eyesight, keratitis, cataract. 1. Visual fatigue: When using electronic products for a long period of time, you will feel dry eyes, blurred eyes and visual fatigue, which can also be caused by lack of sleep. 2. Presbyopia (presbyopia): with the increase of age, the elasticity of the lens decreases, the normal function of the ciliary muscle also decreases gradually, and the eye adjustment ability decreases, long-term looking at the cell phone will lead to blurred vision. 3. Keratitis: Inflammation of the cornea will lead to photophobia, tearing of the eyes, loss of vision, and possibly blurred vision when looking at cell phones. 4. Cataract: The patient’s vision may be blurred due to clouding of the lens caused by various reasons. If blurred vision occurs, it is best to go to the hospital in a timely manner, under the guidance of the doctor to avoid delays in treatment, daily attention to eye hygiene, and develop good eye habits.