The influence of light on vision is mainly reflected in these aspects: stroboscopic, ultraviolet, and color rendering index. The CCTV10 science and education program tested the degree of influence of various lamps on vision. The results showed that there was no stroboscopic, no ultraviolet light, and the color rendering reached more than 90. This shows that LED as an eye protection product seems to be perfect. Is this true?
Experts say
LED is not suitable as a desk lamp. In recent years, the Institute of Electric Light Sources of Fudan University has done a lot of tests on the table lamp market for domestic reading, and found that LED blue light is not good for vision. In addition to the blue light problem, the common problem in the products of LED desk lamps in the past few years is that the luminous flux is insufficient and the light is dark. In addition, in terms of color rendering, the color will be distorted when looking under the LED desk lamp; at the same time, it can only be very In the small part, this is called the light distribution is not suitable; and, the LED table lamp has a brighter light point, and it will be very glaring when it is directly viewed, and the eyes will feel very uncomfortable. At present, the country does not have a unified standard for LED table lamps. Some very small LED desk lamps are actually not beneficial to the eyes. Therefore, in addition to individual products of particularly good quality, it does not play a good role in eye protection.
Principle
For vision, it is not only affected by the single factor of lighting, but also by other factors. It is generally believed that the causes of myopia are: 1. Genetic factors, especially those with high myopia. 2, developmental factors, the curvature of the lens in the eye is gradually larger with age, if the development of the eye, the eye axis is gradually lengthened, then form myopia. 3, environmental factors, this is the main cause of many patients with myopia. The myopia rate among young students is gradually increasing, which is inseparable from the increasingly developed technological products in today's society. The current myopia of young people is mainly caused by the lack of attention to watching TV, surfing the Internet, playing video games, etc., of course, because of the incorrect reading, writing posture, the book is placed close to the eyes, or the lighting conditions are not good. . These will cause the muscles in the ciliary body to continue to contract, the F-degree of the lens grows, the muscles in the ciliary body are in a state of tension, and the lens of F can not be restored to a normal state, thus causing pseudo-myopia. If you still do not pay attention to taking effective prevention measures at this time, it will become true myopia. 4. Other factors, such as changes in nutrients. Therefore, to prevent myopia, not just to change the light, but more should start from other reasons, will make our eyes better!
Online shopping
Because LED desk lamps are light and fashionable products, most consumers still like to go online shopping for LED desk lamps, especially some young students. The current problem is that some Taobao sellers use LED desk lamps as the guise of eye-protection lamps. They advertise one-sidedly to publicize and over-elevate the price of their products. The same LED desk lamp sells for 30 yuan, and also sells more than 300 yuan. This is very easy for consumers to be confused about the purchase. If you choose expensive, you will not be able to make a choice. If you choose cheap, you will not be good. Most sellers on Taobao are mainly focusing on LED desk lamps, but there are still several sellers. Directly wearing LED desk lamps is a way to prevent myopia and protect the eyes from propaganda. The price is higher than similar LED desk lamps. Several times, this excessively exaggerated product use value, the result is that sales are pitiful. For the purchase of LED desk lamps, personal advice is still not expensive.
