Blurred eyes are considered to be related to visual fatigue, refractive error, cataract and so on. 1. Visual fatigue: Long-term work or staring at the cell phone or computer screen for a long time can cause visual fatigue, manifested as blurred vision, blurred vision, eye pain and headache. 2. Refractive error: refers to the parallel light through the refractive system of the eyes and can not image in the retina, resulting in blurred vision, young people tend to myopia, the elderly tend to old eyes. 3. Cataract: mostly seen in the elderly, mainly due to ageing, certain drugs, immune metabolism, trauma, etc. leading to clouding of the lens, causing vision loss and blurred vision. Blurred vision may also be related to other causes, it is recommended to consult a doctor in time to clarify the cause, and under the guidance of the doctor to carry out regular treatment.