Look at classmates play laser pointer curious, just go over, a beam of red light straight to the eye, instantly invisible. Half a month ago, Wuhan, an eye hospital fundus disease room director received a right eye was burned by the laser pointer 10-year-old boy, which is his fourth this year was diagnosed with laser pointer burns children. “Now most of the multimedia lectures will use a laser pointer, the most afraid of accidentally shooting into the eyes of the audience.” In the recently held National Fundus Disease Prevention and Control Summit Forum, the country’s top fundus disease experts and professors twice mentioned that they use the laser pointer “highly nervous”. The scene of a number of top ophthalmologists appealed: please warn the children, do not take the laser pointer as a toy to irradiate each other! Boy was irradiated for a few seconds by permanent damage half a month ago, the clinic came to a 10-year-old boy Peng Peng. “I was shone by a classmate’s laser pointer for a few seconds, and my eyes felt like they were blocked by a big round black dot, and I couldn’t see anything.” The boy whispered with his head down. The doctor’s heart tightened and he hurriedly arranged for an examination. The results show: the left eye vision 1.2, the right eye vision is only 0.2, the bottom of the right eye on the macular area there is a burned round scar. Asked to learn, Peng Peng in Huangpi an elementary school in third grade, classroom class a few boys take out the laser pointer to play, who shot far competition. Pengpeng think fun, just go over, a beam of red light straight into his eyes. He froze for a few seconds and felt as if his right eye was covered by a big round black dot. It wasn’t until the 2nd day when Pengpeng realized how the black dot wouldn’t go away that he told his mom in fear. “Laser damage to the macula is permanent and irreversible, and modern medicine can’t do anything about it.” The doctor regretfully told Pengpeng’s mom. “When laser pointers first became popular last year, we also came across many children whose eyes were burned by laser pointers resulting in loss of central vision.” A professor of ophthalmology at a hospital said that although the eye encounters bright light will instinctively reflexively close the eye, but these few seconds are enough to form irreversible damage to the delicate macula. Center vision damage can not be recovered Laser into the eye, the first injury is the macula. When the eyes look at something, the object into the eye is the first macula “capture”, focus is also rely on the macula to complete. Located in the center of the retina, the macula is the center of human vision, and it is also the most light-sensitive and fragile area. Once this area is burned by the laser, at this time will feel as if a large round black spot in front of the eyes blocked the same. Peng Zhihua image, see things like watching a “total eclipse of the sun”, the center of the black side of the bright. Worst of all, unlike corneas and crystals, which can be transplanted and replaced, this kind of damage cannot be recovered through any surgery or treatment. Often the damage is already done by the time we notice the glare and react to close our eyes. Laser has become an important treatment in ophthalmology, can this treatment damage my vision? When we do laser treatment, the most important point is to absolutely avoid the macular area. Not only does the patient’s macula have to be protected, but the doctor has to wear protective eyewear as well. 1 milliwatt laser is enough to burn the child’s eyes In March of this year, the State Administration of Quality Supervision issued a “laser pointer, children’s laser gun product quality and safety risk warning and consumer tips,” said it is inappropriate for children to buy a laser pointer as a toy to use, consumers should avoid irradiation of the human eye, skin, and clothing and other places when using a laser pointer. The article requires the sale of laser pointers to implement a “grading system”: the degree of harm in descending order: Category 1, 1M, 2, 2M, 3R, 3B, 4, all types of laser pointers should be labeled as categories. Among them, the laser pointer in toys should meet the requirements of Class 1 laser radiation power limit, that is, the output power should be less than 0.4 milliwatts. Laser is parallel light, emission distance, dispersion angle is small, after shooting has been “forward”. In the eyes of the role of this convex mirror, the energy is rapidly focused to the macula, then the power of the focusing point will be amazingly large. Laser pointer greater than 3 milliwatts, will cause permanent damage to the adult macula. The child’s eye tissue is delicate, can withstand a smaller amount, 1 milliwatt or so of laser directly into the eye, it is enough to burn the child’s eyes. 5 kinds of laser pointer all over the children’s “warning line” 100 yuan to buy a rechargeable laser pointer, the maximum power of 35.7 milliwatts, far more than the toy standard. Investigation found that more than 90% of the laser pointer currently on sale are not branded, Chinese labeling, there is no labeling power size. How safe are these laser pointers? Teachers, sales staff, doctors are the use of laser pointer higher frequency occupation, the reporter respectively from the China University of Geosciences teaching center, Dahua sales department and Wuchang Hospital borrowed three laser pointer. According to the sales of laser pointer around the school, the reporter bought a 12 yuan laser pointer and a 100 yuan rechargeable laser pointer in the stationery store. Among them, only the China University of Geosciences teaching center laser pointer has a formal brand. All laser pointer for a new battery, rechargeable laser pointer charging half an hour later, with the optical power meter on the five laser pointer were tested. The results show that the power of all laser pointers are more than children’s “cordon sanitaire”. Among them, China University of Geosciences teaching laser pointer with the smallest power, the maximum power of the test for 2.15 milliwatts; power of the largest laser pointer is the school gate 100 yuan to buy a rechargeable laser pointer, the maximum power of 35.7 milliwatts, if full of power will be higher. 12 yuan a laser pointer, although the cheapest, but the test of the maximum power of 3.5 milliwatts, ranked second. These five laser pointer, the power of all over the children’s “warning line”. Need to use the laser in the experiment, as long as the power is greater than 1 level, that is, more than 0.4 milliwatts, you must wear laser protective glasses, in all visible light, the laser’s energy is the highest, is the most harmful to the eyes.