Can Sunglasses Be Used as Anti-blue Light Glasses?

As more and more people use anti-blue light glasses, many people will also ask if the blue light blocking glasses can block high-energy blue light. Can they be used as sunglasses outdoors? Before answering this question, we need to understand what is ultraviolet light and what is blue light.

The wavelength of light is inversely proportional to the energy of the photon, that is, the shorter the wavelength is, the higher the energy is. Therefore, ultraviolet light is the most powerful light in sunlight, and the damage of ultraviolet light to the eyes is in the front half of the eyeball. When the weather is good, the outdoor sun rays are stronger. Since the human body has an instinctive response to self-protection, we will unconsciously squint our eyes when we want to see things clearly, and the pupils will naturally shrink, which reduces the ultraviolet energy entering the eyes. Moreover, ultraviolet rays will not only induce the occurrence of skin diseases, but also the occurrence of pterygium, cataracts and other eye diseases. This is why we wear sunscreen and sunglasses when we go outdoors. This can block the uncomfortable glare and protect our eyes from UV rays.

But ultraviolet light is invisible light that does not reach the retina of the human eye, only visible light can enter. The most powerful of visible light is blue light with a wavelength between 430nm and 480nm. The damage of blue light to the eyes is on the back half of the eyeball, such as macular degeneration. Since humans have evolved over trillions of years, blue light in nature will not harm human eyes. When are anti blue light glasses used? It is mainly used to filter the light emitted by electronic screens when electronic products are used indoors. Therefore, the blue light that we need to prevent refers to the high-energy blue light in electronic products.

Anti-blue Glasses And Sunglasses

A good anti blue ray lens is yellow-green, and needs to satisfy both the light transmittance and blue light shielding rate. The light transmittance of eyeglasses with blue light protection is about 90%, and the blue light shielding rate is between 60%-70%, and it can also block 99% of ultraviolet rays. The spectrogram of such a lens is very close to the solar spectrum, which allows us to achieve the effect of blocking blue light while the eyes are in a comfortable state. If you are walking outdoors for a short time, such a pair of blue light shield lens can fully meet your eye protection needs outdoors. However, due to the high light transmittance, it is not suitable for long-term outdoor use as sunglasses. Because although it can block ultraviolet rays, it cannot filter strong light well.

The main function of sunglasses is to block the glare and glare, so as to reduce the fatigue caused by eye adjustment or the damage caused by strong light stimulation. The lens colors are generally gray, brown, blue-gray, etc. The most common ones are blue light sunglasses and blue light filter sunglasses. In order to better filter out the ultraviolet rays and reduce the irritation of the strong light to the eyes, the light transmittance of sunglasses is very low, 5%-40% light transmittance is available. This is only suitable for outdoor use when the sun is strong. If you wear sunglasses indoors, at dusk or even at night, because the light is reduced, it will not protect your eyes and even increase the burden on your eyes.

In summary, we have concluded that general anti-blue glasses cannot be used as sunglasses. The main reason is that the functions are different and the usage scenarios are different. It is really too much trouble to prepare two glasses to carry with you, blue light blocking sunglasses is actually a good choice.

There are many types of glasses on the market, such as anti blue light reading glasses, blue light non prescription glasses and anti blue light glasses for kids.