I believe you must have heard of blue block glasses, right??
Many people have specially equipped with anti-blue light glasses because they need to work with mobile phones and computers for a long time. Many parents have prepared a pair of glasses for their children after hearing that these glasses can prevent myopia. Gradually, anti-blue light glasses became "eye protectors". But is there really such a god? What is blue light? Why guard against it? Can blue light blocking glasses really prevent myopia?
What is Blu-ray? How does it affect the eyes?
There are pros and cons to the effects of blue light on the eyes: Long-wave blue light in the wavelength range between 440nm and 500nm is advantageous.
It can reach the optic nerve through the retina and pass to the hypothalamus to synthesize melatonin and serotonin, which can help sleep, improve mood, and improve memory.
Short-wave blue light in the wavelength range of 380nm-440nm is harmful
It can reduce sleep quality and even cause photodamage to the retina.
In addition to sunlight, lights, electronic screen light, these light sources have blue light distribution. At present, all qualified regular lamps and lanterns have blue light energy within the safe range, so the blue light emitted by daily use lamps has negligible impact on normal eyes.
The proportion of short-wave blue light in screen light is higher than that in sunlight, but the total energy is far less than that of sunlight, and qualified electronic products are also not enough to cause damage to the retina.
At present, relevant experiments can confirm that high-dose and long-term continuous blue light irradiation can lead to the apoptosis of retinal photoreceptor cells. However, because the blue light energy distributed by the screen light is low, and most people use the electronic screen for a reasonable time, there has been no case of the screen blue light directly damaging the retina of the human eye.
What is the principle of blue light blocking glasses?
The anti-blue light glasses look like they are covered with a layer of yellow film, and the short-wave blue light is reflected by a layer of coating on the surface of the lens; or an anti-blue light factor is added to the base material of the lens to absorb blue light.
According to the standard of "Technical Requirements for Light Health and Light Safety Application of Blue Light Protective Film", the light transmittance of long-wave blue light is greater than 80%, which means that long-wave blue light, a beneficial blue light, does not need to be protected; anti-blue light glasses really need It reflects and absorbs harmful blue light, also known as short-wave blue light.
However, the quality of the anti-blue light glasses currently on the market varies, and some unqualified anti-blue glasses can achieve the effect of blocking short-wave blue light, but at the same time block long-wave blue light; therefore, when choosing anti-blue glasses, we must pay attention to their Optical transmittance of long-wavelength blue light.
Can anti-blue light glasses prevent myopia from deepening?
There is currently no direct evidence that blue light blocking glasses can prevent myopia from deepening.
We often say that watching a computer, watching TV, and watching a mobile phone for a long time will cause vision loss, because long-term staring at close-up objects will cause changes in the refractive system or eye axis, thereby affecting vision.
Although blue light has little relationship with myopia, it has a significant impact on dry eye patients. In 2016, Japanese dry eye expert Minako Kaido confirmed that for dry eye patients, reducing the exposure of short-wave blue light to the eyes can effectively improve dry eye symptoms. Therefore, people who need to work in front of the screen for a long time will feel comfortable wearing blue light blocking glasses.
Suitable for those who wear anti-blue light lenses
1.Suitable for screen workers with dry eye symptoms: Because blocking short-wave blue light can improve the tear film stability of dry eye patients, anti-blue light glasses can reduce the visual fatigue of screen workers.
2.Suitable for people with macular degeneration: Short-wave blue light has stronger penetrating power for people with fundus lesions than normal people, and wearing anti-blue light glasses may have a certain effect.
3. Suitable for people who are engaged in special work, such as workers who burn glass and use electric welding: such people may be exposed to large doses of blue light, so they need more professional protective glasses to protect the retina.
This type of person is not suitable for wearing.
4.Not suitable for children and adolescents who want to prevent and control myopia: There is currently no report that wearing anti-blue light glasses can slow down the development of myopia, and the background color of anti-blue light glasses is yellowish, which may affect children's visual development.
5.It is not suitable for people who have requirements for color recognition: blue light glasses will block blue light, expose blue yellow, and the color of the screen will be distorted, so it may have a certain impact on the work of such people.
Post time: Oct-21-2022