Nowadays, cell phones, computers and tablets and other electronic devices are becoming more and more common, and many people, including children, like to play with their smartphones before going to bed at night. The damage to the eyes from playing with cell phones after turning off the lights is mainly reflected in the following three aspects: 1. The main complaint of patients is dry eyes, eye swelling and foreign body sensation, usually there will be conjunctival congestion, dryness and even punctate detachment of corneal epithelium, in fact, the normal structure of the eye surface is destroyed; generally blink about 20 times per minute, when using cell phones because of excessive concentration, the number of blinks per minute will be reduced, and the screen light of cell phones is more harsh after turning off the lights, resulting in reduced tear secretion and changes in tear composition, once Tear film stability and the integrity of the corneal epithelium is damaged, it will lead to the occurrence of dry eye; 2, cause glaucoma: using the eyes in a dim environment will cause the pupil to dilate for a long time, blocking the atrial circulation pathway to induce glaucoma, some people originally have small eye structure, shallow anterior chamber, etc., a long time to turn off the lights to play cell phones will trigger acute angle-closure glaucoma attack, serious cases can even lead to permanent 3, affect the macular lesion: macular area is the most sensitive place of vision, more than 90% of the vision of the human eye is dependent on the macula, so once the macular area lesion occurs, it will lead to a sharp decline in vision, visual deformation, etc., further leading to a serious decline in the quality of life; macular lesion is most mainly related to long-term chronic light damage in the macular area, choroidal vascular sclerosis, retinal pigment epithelial cell aging, many Of course, there is no evidence that there must be a causal relationship between playing with cell phone and macular lesion, but the cell phone screen is especially bright in the dark environment after turning off the light, and when viewed for a long time at close distance, the high energy blue light will be directed to the eyes, and it is hard to say whether it will cause macular light damage in the long run. Therefore, it is not recommended for people to play cell phones for a long time after turning off the lights for the sake of eye health, as it may cause eye surface damage, glaucoma attack and macular degeneration.