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Bemore Optics- Anti blue light glasses
By bemoreoptics October 20th, 2023 152 views
Bemore Optics- Anti blue light glasses
Do anti-blue light glasses really work?


One of the major pain points for office workers nowadays is overuse of their eyes. Sometimes their eyes feel dry and uncomfortable, so people who know a little bit about this will want to use anti-blue light glasses instead. But are these anti-blue light glasses really useful?

This blue light plays different roles during the day and at night. It is beneficial during the day: it can inhibit the secretion of melatonin and help maintain physical and mental health and good cognitive abilities.
It is harmful at night. Long-term exposure to blue light before going to bed will affect sleep quality and biological clock, and is related to the occurrence of many chronic diseases.

A 2019 study on Drosophila also showed that long-term and sustained exposure to blue light can lead to reduced lifespan and accelerated aging, even if not through the retinal pathway. However, you don’t need to worry too much. The solution to the problem of affecting circadian rhythm is very simple - just pay attention to playing less/no mobile phones/tablets/computers before going to bed. (Although for some students this is quite difficult...

First of all, we need to understand the impact of blue light on the eyes. Of course, we are more concerned about the damage caused by blue light to the eyes, which is now generally considered to be relatively okay. Although experimental data obtained from different animal experimental models show that blue light does cause damage to the eyes, it is only concentrated in the 400-460nm range, and the remaining wavelength ranges have little effect. This may be related to the long-term exposure of lipofuscin (absorption peak near 450nm) to blue light, retinal damage caused by the production of free radicals, and the accumulation of lipofuscin in the macula.
However, the article also reminds that this kind of damage also needs to take into account the duration and intensity of blue light exposure, as well as the differences in the ability of different human/animal eyes to filter blue light and scavenge free radicals.

Speaking of intensity, does it feel like screen blue light is stronger than daylight/lighting? Not really.
Not only that, the blue light hazard level of electronic products is still very low, and it does not reach the level of harmfulness to the eyes in the experiment. You must not take it for granted.
Studies have shown that mobile phone screens and computer screens can only reach the lowest level of RG0 blue light hazard at the maximum achievable brightness, while the level of general LED lights is RG2.
Even if you know that the harm level of blue light from the screen is low, you don’t need to worry too much, but most students may still think that blue light has caused harm to their eyes through their own experience of sore eyes when looking at the screen.
So let’s take a look at whether we need to wear glasses for protection.

There are generally two types of blue light glasses available on the market: one with coating and the other with blue light absorbing material. They all claim that they can eliminate eye fatigue and prevent eye diseases.
But we don’t need to distinguish who is better and who is worse, because judging from the existing data, anti-blue light glasses are not a necessity, and most merchants’ promotions are intimidating and exaggerated.

Why don’t you need to wear anti-blue light glasses?
There is no need to wear blue light glasses because: eye fatigue has nothing to do with screen blue light; there is no evidence that screen blue light will cause eye diseases; and the yellow coating on the lenses can interfere with color perception.

The American Academy of Ophthalmology (AAO) published relevant articles on "No need to wear blue light glasses" in 2016, 2017, and 2020 respectively.
Combining these articles with what we have said before, it can be seen that although overexposure to blue light will increase the risk of eye diseases, the intensity of blue light emitted by electronic devices is very small and the level of harm is low. There is still no evidence that small amounts of blue light from electronic device screens cause any harm to our eyes.

Not only that, anti-blue light glasses generally have a yellowish lens color, which can interfere with work for designers and other professions that require high color perception. Moreover, long-term wearing of polarized glasses is not conducive to the visual development of teenagers.
So what’s going on with our tired/dry eyes?
The American Academy of Ophthalmology also explained that the eye discomfort we experience when using electronic products is caused by a reduction in the number of blinks.

Normally, humans blink about 15 times per minute, but when staring at a screen or doing other close work, such as reading, the blink rate is reduced by half. The muscles around the eyes are tense and the surface of the eyes cannot be moistened in time, which causes fatigue and dryness.

I do feel relief from using blue light glasses, can I still use them?

Although theoretically we do not need a pair of blue light glasses, many users do subjectively believe that wearing blue light glasses will make their eyes more comfortable.There are many reasons that can be found. For example, the eyes are particularly sensitive to light. Yellow lenses change the cold light of the screen into warm light, reducing the "glare" level, etc. So it doesn’t mean that anti-blue light glasses will be nailed to the pillar of shame from now on. If everyone thinks they are good, they can continue to use them.
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