Views:124 Author:Site Editor Publish Time: 2020-11-18 Origin:Site
Anti blue light blocking glasses are glasses that prevent blue light from irritating your eyes. The special anti blue light glasses can effectively isolate ultraviolet rays and radiation and can filter blue light. It is suitable for use when watching computers or TV mobile phones, reducing the damage of blue light to our glasses.
1) Eye injury: Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, causing atrophy or even death of retinal pigment epithelial cells. The death of light-sensitive cells will cause vision loss or even complete loss. This damage is irreversible. Blue light can also cause macular degeneration. The lens in the human eye will absorb part of the blue light and gradually become cloudy to form a cataract, and most of the blue light will penetrate the lens, especially the children's lens is clearer and cannot effectively withstand the blue light, which is more likely to cause macular disease and cataracts.
2) Visual fatigue: Due to the short wavelength of blue light, the focus point does not fall on the center of the retina, but a bit closer to the front of the retina. If you want to see clearly, the eyeball will be in a state of tension for a long time, causing visual fatigue. Long-term visual fatigue may cause symptoms such as deepening of myopia, diplopia, easy serial reading, and inability to concentrate, affecting people's learning and work efficiency.
3) Poor sleep: Blue light can inhibit the secretion of melatonin, and melatonin is an important hormone that affects sleep. This can also explain why playing with a mobile phone or tablet before going to bed can cause the quality of sleep to be low or even difficult to fall asleep.
For natural blue light at outdoors, it is not recommended to wear anti blue light glasses. If you are not facing the computer screen for a long time, you don't need to wear blue light blocking glasses. Outdoor natural light has a certain protective effect on the eyes. We often recommend that it is best to maintain 2 hours of outdoor time. In fact, it is to allow the eyes to receive natural light, contract the pupils, increase the focus of the eyes, and make the things you see more clear, so as to prevent the occurrence and development of myopia.
Only when the intensity and time of blue light irradiation reach a certain level will it cause damage to human eyes. For those who really need to work and study at the computer for a long time every day, blue light blocking computer glasses can be used appropriately. Anti-blue light glasses only reduce blue eyes radiation by weakening or blocking blue light radiation. Therefore, a pair of qualified blue light eyeglasses will make the beneficial blue light leaved and the harmful blue light filtered out, and truly protect the eyes.
The technology of blue light filter glasses is relatively mature, and the best ones are mainly from the United States and Taiwan, certainly, some companies in the mainland can also make qualified glasses.
The three most important data for anti blue light glasses lenses are anti-blue light rate, light transmittance, and chromatic aberration. The three are indispensable. The anti-blue light rate generally needs to be above 40%, the light transmittance generally needs to be above 90%, and the lower the color difference, the better. If you excessively pursue the anti-blue light rate, at the expense of light transmittance and chromatic aberration, the burden on the glasses is very large, and it is counterproductive.
Excellent anti-blue light glasses should minimize chromatic aberration on the basis of ensuring the anti-blue light rate. There are three options for myopia: clip type, matching degree type and lens set. Clips are the most conventional. Most brands can control the weight of clips to less than 10 grams. It is more convenient to wear and has the best anti-blue light effect. The advantage of the method of matching degrees is to convenience , but the disadvantage is to sacrifice the anti-blue light effect. The mode of the lens set guarantees the anti-blue light effect, but the wearing comfort will be reduced. People with myopia need to choose a more suitable fashion blue light glasses according to their own needs.