In the previous article, we discussed “Are polarized sunglasses better for kids?”. In this article, let’s talk about “How much does it cost to add blue light filter to glasses?”.
Our daily lives are inseparable from mobile phones, computers, tablet computers, and other electronic products. Many people's eyesight is also going downhill due to long-term exposure to strong light electronic screens, and their eyes are more or less potentially adversely affected. It is found that many optical stores sell blue light filter glasses, which have the function of blocking 99.9% UV and scattered blue light, alleviating visual fatigue. They claim that these glasses can block short-wave blue light emitted by electronic products such as mobile phones and computers, and even prevent age-related macular degeneration so they are much sought after by consumers. The price of these so-called anti-blue-light glasses varies greatly, ranging from dozens of dollars to several thousand dollars. Do these blue light blocking glasses really have so many magical functions?
What is blue light?
The natural light seen by the human eye is composed of a spectrum of different colors, including red light, orange light, yellow light, green light, blue light, indigo light, purple light, which gives people a visual feeling of white. Different wavelengths present different colors visually, and the shorter the wavelength, the higher the energy. At present, products with electronic screens such as computers and mobile phones use LEDs and other materials to emit light mainly in three colors of red, green, and blue, and blue light accounts for the main part. Blue light belongs to the range of visible light, belongs to short waves. And the wavelength is between 400 nanometers and 500 nanometers, which is close to ultraviolet and carries a large amount of energy. And this part from 400 nanometers to 450 nanometers is called high-energy short-wave blue light.(https://www.koalaeye.com/collections/blue-light-blocking-glasses)
Do blue light glasses actually block blue light?
Anti-blue light glasses are still popular on the market. This kind of glasses is said to be 'anti-radiation and anti-blue light', but this kind of hot-selling anti-blue glasses has many problems. At present, such anti-blue glasses mainly block or absorb blue light through special materials, but there are two misunderstandings in its blue light protection. One is that the protection is not preventable, and the other is that the color cast caused by the wrong protection makes visual fatigue aggravated. Studies have shown that our eyes are the most intolerant of blue light in the 400nm to 440nm band. Therefore, current manufacturers mainly block blue light in this band when producing anti-blue glasses. But the electronic products that we often come into contact with nowadays produce blue light between 450 nanometers and 490 nanometers, and anti-blue glasses have almost no protection in this wavelength. Generally speaking, the blocking rate of anti-blue glasses is 20% to 30%, but now the blocking rate of anti-blue glasses on the market basically reaches 80% to 90%. This high blocking rate can also easily cause a color shift. , It is easier to make the eyes tired.
How much does it cost to add blue light filter to glasses?
Based on the difference in the impact of blue light of different bands on the human body, the blue light transmittance of each band of the product is separately required. For example, in the range of 415-445 nanometers, the light transmittance should be less than or equal to 80%, and above 445 nanometers, it should be greater than 80%. In this way, the anti-blue light products can be restricted, which can effectively shield the blue light that poses a health and safety risk to the human body, but also allows the blue light of the waveband that regulates the human body's circadian rhythm to be effectively transmitted.
Anti-blue glasses are not suitable for everyone. It is only suitable for people who use electronic products for a long time, not for people who are visually fatigued, and teenagers should not wear them for a long time. Furthermore, anti-blue glasses should not be regarded as a 'talisman' and use your eyes uncontrollably after wearing them. Therefore, when using electronic equipment, people must abide by the laws of nature, ensure the normal rest of the eyes, and maintain eye health.
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