Blurred vision after looking at a cell phone may be related to visual fatigue, or it may be caused by refractive error, dry eye and other reasons. 1. Visual fatigue: If the patient looks at the cell phone for a long time at a close distance, especially at night after the lights are turned off, looking at the cell phone for a long time in a dark environment, it is easy to cause visual fatigue, resulting in ciliary muscle spasm for a long time, which may lead to blurred vision after looking at the cell phone, and may be accompanied by dry eyes, swelling and pain and other uncomfortable symptoms. 2. Refractive error: If patients frequently look at the cell phone for a long time, it is easy to lead to refractive error, especially the problem of myopia is more common, due to myopia, which will cause patients to have blurred vision, especially after a long time of looking at the cell phone, the blurring of vision performance is obvious. 3. Dry eye disease: If you suffer from dry eye disease, your eyes can not secrete enough tears, so your eyes can not be effectively moisturized for a long time, coupled with a long time looking at the cell phone, may aggravate the dry eye disease, resulting in blurring of vision after looking at the cell phone, which can also be accompanied by photophobia, tearing and other symptoms. It is recommended that patients with blurred vision consult a doctor to assess their condition and follow the doctor’s instructions for treatment.