Anti-Blue Light Glasses Really Protect Your Eyes?

Anti-Blue Light Glasses Really Protect Your Eyes?

Recently, the number of "anti-blue light glasses" is very high, many people say that the "anti-blue light glasses" on the market have a variety of styles and prices, which are said to be anti-radiation, anti-blue light and anti-fatigue.
So, what exactly is "blue light"? Are human eyes really afraid of blue light? Are blue glasses an IQ tax?

It depends on the situation

Blue light is a wavelength of 400~500 nanometers of high energy visible light, is widely used in LED technology, used to improve the quality of electronic products, such as mobile phones, computers, lighting and other digital products based on LED technology display.

However, "anti-blue light" refers to preventing excessive high-energy blue light, not blocking all blue light.

In the blue spectrum of 400 to 500 nanometers, it can be subdivided into 400 to 440 nanometers of blue light (shorter wavelength) and 440 to 500 nanometers of blue light (longer wavelength).

Studies have found that 440~500 nanometers of blue light has the effect of regulating circadian rhythm and affecting night vision, so this part of blue light has certain benefits for the body.

Blue light of 400 to 440 nanometers, because of its short wavelength, focuses on the retina after passing through the lens at the front of the eye, making the ciliary muscle need more adjustment to see the image clearly, otherwise it will be blurred. Looking at things for a long time is easy to produce visual fatigue. In addition to its effect on the eyes, this blue light also stimulates cortisol production and suppresses melatonin production, which can lead to insomnia.

In addition, many parents are looking to anti-blue glasses to prevent myopia caused by excessive use of electronic products in children. On July 13, 2020, the China Consumers Association also issued a reminder that anti-blue light ≠ anti-myopia. At present, there is no clear evidence from theoretical studies or clinical data to support that blue light will increase the progression of myopia.

Can blue light be prevented?

There are two ways to "anti-blue light", one is to add anti-blue light factors in the lens, which can absorb harmful blue light when the blue light passes through the lens. The other is to coat the lens with an optical film that reflects the blue light back.
Now high-quality "anti-blue glasses", mainly filter 400~440 nm blue light. However, many mobile phone film and glasses on the market claim that they can "prevent blue light", the quality is uneven, the price difference is huge, in the end there is no effect, there is still a lack of strong evidence.

It is recommended to buy "anti-blue glasses", be sure to choose a regular brand in a regular institution, must not coopt cheap to buy inferior "anti-blue glasses", not only can not protect the eyes, but also cause certain damage.

In addition, developing scientific eye habits and controlling the use time and distance of mobile phones is an effective means to protect eyesight.