The hazards of watching cell phones with the lights off at night may affect your eyesight and cause eye inflammation. After turning off the lights to look at the cell phone will first make the eyes feel fatigue, if the lights off for a long time to play the phone, so that the eyes are in a dark environment, the eyes of the contrast sensitivity decreases, after a long time will cause eye dryness, eye distension, the eyes have a sense of foreign body and other symptoms, but also may cause conjunctivitis and other inflammation of the eyes. In the long run, it will also have a certain impact on vision, resulting in varying degrees of myopia. It is recommended that you try to leave a light on to play with your cell phone in your daily life, and also try not to use electronic products for a long time, so as not to harm your eyes. Keep regular sleep, do not stay up late for a long time, put down your cell phone after turning off the light, close your eyes in order to get to sleep as soon as possible. If you feel uncomfortable symptoms in the eyes, consult a doctor for examination and appropriate treatment.