Turning off the lights and playing with the phone before going to bed can lead to glaucoma and even blindness? This is by no means alarming. Experts warn that using your eyes in dim light will cause the pupil to dilate for a long time, blocking the circulation of fluid in the eye, which can easily lead to the occurrence of glaucoma and even permanent blindness. If you really want to play with the phone, turn on a less bright light. The 30-year-old Miss Zhang is a clerk in a company. Before going to bed, she habitually turned off the lights, playing mobile games and watching the news in the dark environment, the result was really “hit”. Playing with the phone in the dark caused a big problem. The situation of playing with the phone with the lights off lasted about a month or so, and one morning, Miss Zhang’s eyes suddenly stung unbearably. Later she came to the Eye Hospital of Sun Yat-sen University for examination, was diagnosed as glaucoma. Doctors said that the cause of the disease is Miss Zhang’s long-term use of computers or play cell phones in a dark environment, resulting in elevated intraocular pressure, insufficient blood supply to the eye, the front and back of the eye atrial fluid can not flow, resulting in an acute attack of glaucoma. If the problem of atrial fluid blockage is not solved as soon as possible, Ms. Zhang’s eyes may go blind. Eventually, the hospital was able to circulate the water from the posterior chamber of her eye to the anterior chamber through a peripheral iridotomy. Ms. Zhang herself was surprised to develop glaucoma because she was looking at her cell phone in the dark, and she had surgery for it, taking a full month off work. In the following six months, she did not dare to use her eyes excessively, and did not dare to spend more than 2 hours continuously on the computer. The principle: the pupil is dilated in the dark, and the lights to play with the phone is really so harmful? Wu Zhihong, director of ophthalmology at the General Hospital of the Armed Police, reminded that using the eyes in dim light can cause the pupil to dilate for a long time, blocking the circulation of fluid in the eye, which can easily lead to the occurrence of glaucoma. Glaucoma is the first irreversible blinding eye disease in China. Dr. Lin Xiaofeng, chief physician of ocular trauma at the Eye Hospital of Sun Yat-sen University, also said yesterday that glaucoma is an eye disease in which the pressure inside the eye is either intermittently or continuously elevated. Elevated intraocular pressure can have different symptoms depending on its etiology. Persistent high intraocular pressure can bring damage to various parts of the eye tissues and visual functions, causing vision loss and narrowing of the visual field. If left untreated, it may even lead to blindness. According to the opening and closing of the atrial angle when the intraocular pressure is elevated, glaucoma can be divided into two types: closed-angle and open-angle. If you look at your cell phone in a dark environment for a long time, the pupil will naturally dilate, which will trigger closed-angle glaucoma, which causes damage to the optic nerve if the intraocular pressure of glaucoma is not controlled, and you will go blind. Turn on a low-lighting lamp The low contrast sensitivity of the eyes in the dark can cause an increased burden on the eye’s regulatory system, which can further lead to increased myopia. To reduce the load on the eyes, it is best to adjust the contrast of the phone screen to make the brightness and color as soft as possible. If possible, you should turn on a low brightness background lighting in the room to moderate the gap between the screen and the background environment, which can play a protective role for the eyes. The screen light in the dark contrast is too large, long-term stimulation of the human nervous system, but also easy to cause insomnia. In addition, lying down to play with the phone is also a bad habit, this posture is the largest pressure on the eye, easy to cause vision loss.