Blurred eyes can be caused by visual fatigue, presbyopia, cataract, refractive error and so on. 1. Visual fatigue: excessive use of eyes, such as reading books or watching electronic products for a long time, will easily lead to blurring of the eyes, and may be accompanied by eye soreness, dryness and other uncomfortable symptoms. 2. Presbyopia: With age, the elasticity of the patient’s lens decreases, and the adjustment of the eyes decreases, so the patient develops presbyopia, which leads to the symptoms of blurred vision. 3. Cataract: Cataract is a visual disorder caused by clouding of the lens. Early discomfort symptoms are not obvious, but with the progress of the disease, patients may experience blurred vision or even blindness. 4. Refractive error: Refractive error includes astigmatism, nearsightedness, farsightedness, etc., and patients may have different degrees of blurred vision. It is recommended that patients with blurred vision consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.