Nowadays, many people have the habit of playing with cell phones at night with the lights off. If the time is long, the most direct effect is that it will cause certain damage to the eyes, such as causing visual fatigue, affecting the eye table, causing vision deviation, damaging the macular area and glaucoma major attack and other eye diseases. In addition, long-term night lights to play cell phones, but also damage to the skin, cervical spine and affect the rest and so on. A, damage to the eyes: 1, visual fatigue: lights off at night to play cell phones for a long time, the eye muscles are forced to work without rest, which makes it difficult to focus vision, and can cause pain, eye fatigue; 2, affect the eye table: lights off for a long time to play cell phones will make the eyes in a dark environment, the eye contrast sensitivity decreased, the burden of the regulatory system increased, affecting the eye table, over time will cause eye dryness, eye swelling, foreign body sensation and other symptoms. Eye swelling, foreign body feeling and other symptoms, and even cause dry eye, chronic conjunctivitis and other symptoms; 3, cause vision deviation: after turning off the lights most people in bed is lying on the side to play cell phones, so the pressure on the left and right eyes is relatively large, resulting in insufficient blood supply around the eyes, may lead to left and right eye vision deviation, long time will make the eyes produce a sense of expansion and short-term image overlap; 4, damage to the macula: long time lights off Playing with cell phone will make high energy blue light directly into the eyes, causing retinal damage, burning, damage and even lesions in the macula. There may be sharp vision loss, visual distortion and other symptoms, causing serious impact on the quality of life. At present, although there is no proof that macular zone lesions and playing with cell phones have a direct relationship, but it is easy to cause damage in the long run; 5, induce glaucoma grand mal: long time pupil dilation in dim environment, close eye use, moving regulation, crystal thickening. For the original existence of shallow anterior chamber, the eye small people, easy to cause atrial circulation pathway blockage, causing glaucoma grand mal or other related eye diseases. Second, damage to the skin: when playing cell phones usually cell phones close to the face, the bright light of the screen will stimulate the skin, long-term will make the skin oil, acne, large pores, and prolonged radiation will also accelerate skin aging, causing dry skin, but also inhibit melatonin secretion leads to melanin deposition, etc. Third, damage to the cervical spine: night lights to play cell phones will generally be more focused, may lead to a long time without changing the posture, it is possible to affect the human cervical spine, will make the joints congested, over time, easy to get cervical spondylosis. Fourth, affect the rest: at night, the bright light of the cell phone screen will affect the pituitary melatonin secretion, will make the normal human circadian biological clock rhythm changes, manifested as night insomnia, daytime fatigue. Therefore, you should try to avoid playing with the phone with the lights off for a long time, if you must play with the phone before going to bed, try not to exceed one hour, and turn the phone brightness to soft.