Eye lamps - can not prevent myopia
Now some eye lamps can prevent myopia publicity, if there is really a clinical effect, it should also belong to the category of medical devices. The understanding of medical devices, should be based on scientific and systematic clinical trials, and reported to the competent authorities for approval. Currently on the market eye lamps have not gone through this experiment, in this case to "prevent myopia" publicity is irresponsible.
Eye lamps - hazards
One, the white light from the eye lamp is too strong, reading and writing in this light will feel reflective or blinding, causing visual fatigue and vision loss. As all the current eye lamps are using fluorescent tubes as a light source, and the vast majority of fluorescent lamps emit white light, white light compared to yellow light shortcomings is that it will make people feel reflective or blinding, so when the students look at things in the white light, a long time (generally more than 15 minutes), the eyes will feel fatigue or soreness. Why is this so? In fact, the yellow spot area inside the human eye (that is to say, the bottom color of the eye is yellow) is most receptive to yellow light rather than white light, which is why reading and writing under yellow light will feel soft and comfortable, while under white light will feel stinging or fatigue of the root cause. Some parents say that the color of light emitted by eye protection lamps used at home is also yellow. Then, the promoter should ask whether the lamp he uses is a bulb or a tube? If it is made of lamps, the light color emitted is yellow, then the promoter can clearly tell him: "This yellow light is emitted in the case of a yellow substance coated inside the lamp, the light produced by this lamp is still essentially white, and the real yellow light refers to the warm light, and only light emitted from lamps made of bulbs is the real yellow light. Therefore, although your home light is yellow light, but that is false yellow, and the yellow light produced by the light bulb is fundamentally different, in this yellow light to see things will still be blinding, only slightly better than other fluorescent lamps issued by the white light." Second, all eye protection lamps made from fluorescent lamps produce serious ultraviolet radiation, which can cause some damage to students' eyes and skin. As all the current eye lamps are using fluorescent tubes as a light source, and fluorescent lamps must be through the ultraviolet light excitation phosphor to produce light, ultraviolet disinfection lamps is to use this principle to produce ultraviolet disinfection. So all fluorescent lamps produce UV radiation, including the most commonly used fluorescent lamps. But why don't we say that fluorescent lamps are harmful while eye protection lamps are? That is because, fluorescent lamps are generally far away from our bodies (at least 2.5 meters), and fluorescent lamps produced by ultraviolet radiation in the distance of 1-2 meters will have a certain degree of damage to the human eye, if within 0.6 meters will be exacerbated by the damage, and eye lamps from the distance from the students is certainly less than 0.6 meters, so fluorescent lamps produce ultraviolet radiation does not constitute a hazard to people! But the UV radiation produced by eye protection lamps will be very harmful to people. Fudan University Eye Hospital's ophthalmology director Prof. Zhou once wrote in the Morning Post: If long exposure to ultraviolet radiation will cause damage to the eye lens and retina, resulting in vision loss, or even blindness! Eye protection lamp
Eye protection lamp Third, the biggest problem of eye protection lamp is electromagnetic radiation on the student brain will cause great harm. The so-called eye lamp is the most important selling point is that no strobe, that is to say, the light of this lamp is stable, will not be a flash. This is relative to fluorescent lamps and comparisons, due to the fluorescent lamp current frequency is 50 Hz, so the fluorescent lamp light will produce a flickering feeling (stroboscopic), and this flickering speed is exactly 50 back and forth per second (that is, 100 times). Eye lamp is to avoid this flickering feeling, the use of high-frequency electronic rectifiers to adjust the current frequency to thousands of Hz or even tens of thousands of Hz, that is to say, will be the speed of the light flickering adjusted to thousands of times per second or even tens of thousands of times. When the speed of light flashes to thousands of times per second, the human eye's reaction has been unable to keep up with this speed, then there will be a feeling: this light is not a flash, is stable. (Note: when the bicycle riding slower, we can see the wheel is composed of steel wire, but when the bicycle riding fast, we can not see the steel wire, only see a circle). Therefore, eye lamps from the real sense: should not be no strobe but high-frequency flashing, is high enough to the human eye does not feel the speed only. It is this feature of the eye lamp, it sends out the light is more stable and more comfortable compared to fluorescent lamps. However, high-frequency electronic rectifier will bring a very serious problem, that is, will produce high-frequency electromagnetic radiation. High-frequency electromagnetic radiation is harmful to people, especially to the brain of students who are in the developmental stage. Many parents know that the electromagnetic radiation from cell phones is harmful to students, so children should try to use as few cell phones as possible, but do not know that the harm of electromagnetic radiation produced by eye protection lamps is much greater than that of cell phones, because of its higher frequency and longer use.