What is Blu ray
Do you know what this kind of blue light specifically refers to? According to science and technology daily, blue light is a kind of visible light and belongs to high-energy short wave. High energy short wave blue light is one of the factors leading to eye fatigue. If the eyes are exposed to blue light for a long time, the blue light can penetrate the lens and reach the retina directly, causing photochemical damage to the retina and affecting vision. Modern LED screens, mobile phones, computers and other artificial light sources are full of this light. If the eyes are irradiated with blue light for a long time, it will make the eyes tired. Once the eyes are over irradiated, it may cause vision problems and even eye diseases.
Difference between anti blue light lens and ordinary lens
According to Nanfang Daily, Lu Jinhua, an optometry expert at the affiliated ophthalmic hospital of Sun Yat sen University, said, "ordinary glasses can absorb some ultraviolet rays, but it is difficult to resist long wave ultraviolet rays, while blue light filter glasses are added with some special materials that can absorb blue and purple light, which can reduce the damage of external light to the eyes." Through the introduction of experts, it is not difficult to understand the working principle of anti blue light glasses, that is, through the lens of special materials to block and reflect high-energy short wave blue light, so as to protect the eyes from blue light damage.
How to judge the effect of anti blue light glasses
The glasses store clerk may use such an experiment to persuade you to buy anti blue light glasses: he uses a laser pen to irradiate the ordinary lens and anti blue light lens respectively. The ordinary lens will blacken and the anti blue light glasses will not change. Is this method reliable? According to Changchun daily, testing anti blue light lenses requires special equipment. It is impossible to judge the effect of anti blue light glasses, because there is no mandatory quality testing standard for anti blue light lenses.