There are two common types of anti-blue light glasses on the market

One method is to coat the surface of the lens with a film that can reflect shortwave blue light, thereby achieving protective functions. The lens itself is colorless and transparent, but the disadvantage is that the surface of the lens will reflect light.

Another type of lens is protected by the principle of color permeation, which involves the infiltration of pigments into the lens material (i.e., colored lenses) to absorb blue light. The lenses themselves have a light yellow background color.

5、 What kind of anti-blue light glasses is good?

① The transmittance of blue light

Firstly, it should be clarified that not all blue light is harmful, and some blue light in the blue light band is beneficial. The Blue light between 455-500 nm is beneficial and has important roles in regulating the Circadian rhythm, producing dark vision, and affecting the development of refraction.

We can mainly see the filtering effect of glasses from the test report. For example, the transmittance test of HELIUM BLUE BLOCKER glasses.

The transmittance of 400-450 nanometers is 40%, so the absorption rate is 60%. Simultaneously maintaining a high transmittance of blue light above 450 nanometers, such glasses are more suitable for use as anti-blue light glasses.

② Will there be color deviation when seeing things after wearing blue light-resistant glasses

Because the background color of the glasses is yellow, there will be color deviation, which is a matter of degree. Simply put, glasses that block blue light are not necessarily good. Glasses that block blue light while also ensuring that other wavelengths of light are not affected, resulting in color distortion, are better anti-blue light glasses.

Some anti-blue light glasses may have significant color differences, not only due to technical deviations but also because during the production process of anti-blue light glasses, manufacturers adhere to the erroneous concept that the more blue light is filtered, the more eye protection is achieved. While filtering blue light, they accidentally filter out adjacent blue light, resulting in a deep orange color on the glasses. After wearing such anti-blue light glasses, It can cause serious distortion of red and green light, causing deviation in what people see, which is not conducive to the health of the eyes.

Should I buy anti-blue light glasses or not?

Based on your purpose:

I want to protect my child's vision.

Conclusion: Do not buy, preventing blue light does not protect your vision.

I want to use it to protect against ultraviolet radiation.

Conclusion: Do not buy, as the anti-blue light and anti-ultraviolet functions are not the same. Please choose appropriate ultraviolet or infrared protective glasses based on the light waves you are exposed to.

I have been watching the screen for too long and want to relieve eye fatigue.

Conclusion: The best way to relieve eye fatigue is to rest every 20 minutes, but if you don't have time to rest, it is recommended to choose a pair of glasses with 20-60% blue light protection.

4. I tend to suffer from insomnia at night.

Conclusion: It is recommended to choose standard blue light protective glasses when working overtime or SOHO at night.