Why do blue light blocking lenses turn yellow?

Some people’s lenses look blue, some purple, and some green. And the blue light blocking glasses recommended for me are yellowish. So why do blue light blocking lenses turn yellow?

Optically speaking, white light consists of seven colors of light, all of which are indispensable. Blue light is an important part of visible light, and nature itself has no separate white light. Blue light is mixed with green light and yellow light to present white light. Green light and yellow light have less energy and are less irritating to the eyes, while blue light has short wavelengths and high energy, which is more irritating to the eyes.

From the color point of view, the anti-blue light lens will show a certain color, and the concentrated expression is light yellow. Therefore, if the colorless lens advertises that it can resist blue light, it is basically a fool. Because filtering blue light means that the spectrum accepted by the eyes is incomplete compared with the natural spectrum, so there will be chromatic aberration, and the amount of chromatic aberration depends on the perception range of each person and the quality of the lens itself.

So, is the darker the lens the better? In fact, it is not the case. Transparent or dark yellow lenses cannot effectively block blue light, while light yellow lenses can prevent blue light without affecting the normal light passage. This point may be easily overlooked by many friends when buying anti-blue light glasses. Just imagine, if more than 90% of blue light is blocked, it means that you basically can’t see white light, then you can distinguish whether it is good or bad for the eyes?

The quality of the lens depends on the refractive index, dispersion coefficient, and layers of different functions. The higher the refractive index, the thinner the lens, the higher the dispersion, the clearer the view, and the different layers are mainly anti-ultraviolet, anti-blue light of the electronic screen, anti-static, dust, etc.

Experts say this: “Blue light radiation is high-energy visible light with a wavelength of 400-500 nanometers, which is the most energetic light in visible light. High-energy blue light is 10 times more harmful to the eyes than ordinary light.” This shows the power of blue light. How big! After learning about the dangers of blue light, the editor also went to wear a pair of anti-blue light glasses, so the glasses of the editor also turned yellow!