But every time before and after wearing glasses, everyone has doubts: Are the anti-blue light glasses you bought really anti-blue light? How to identify anti-blue light glasses?
Indeed, the anti-blue light lenses on the market have been misleading in recent years. Based on my experience in wearing glasses over the years, when you buy anti-blue light glasses, you must not believe the merchants that they are anti-blue light. Whether it is true or not is to verify the truth.
How to tell whether the your glasses are anti-blue light glasses, in addition to professional equipment inspection, in fact, there are also some small skills to assist in the judgment in daily life. Together, the accuracy rate is quite high. You can take a look at:
Step 1: Before dispensing glasses, remember to check the relevant instructions of the lens and the relevant test report of the lens.
Step 2: You can check whether the lens shows high-definition light yellow. High-quality anti-blue light glasses, the lens will have a slight yellow, but it does not hinder the line of sight, and the light transmittance is high.
Step 3: Place the glasses in front of the display screen, or check under the LED light to see if blue light is reflected on the lens surface, indicating that the anti-blue light glasses can block blue light.
Step 4: You can buy and test, high-quality anti-blue light glasses, no harmful blue light will pass through under the irradiation of the test pen.
(The anti-blue light test card is not expensive, you can buy it online, and some optical shops also have it)
Step 5: You can go to a professional optical shop for testing.
Tips for purchasing anti-blue light glasses: when buying anti-blue light glasses
1. Some shop assistants will recommend green anti-blue light glasses to buyers, and explain that the principle of tinted lenses is different. At this time, you should be careful, because green cannot really prevent blue light.
2. There are also anti-blue light lenses that are bluish. This kind of anti-blue light without background color cannot completely prevent blue light from entering the eyeball, and generally only reaches 20%-30%.
3. The real anti-blue light eyes should be yellowish. Based on the basic principle of optics, the light reflected on the lens is to resist the light of the same color as it. As the name suggests, anti-blue light is to reflect blue light, remove the blue light, and only yellow is left in the red, yellow, blue and green in visible light.
Blue light is one of the factors that affect eye fatigue. Anti-blue light glasses can protect the eyes to a certain extent, especially for those who stare at electronic screens for a long time. However, when choosing blue light glasses, you must pay attention to the fact that the glasses must have an authoritative detection mark. The lenses are generally light yellow, and the glasses are effective if the blocking rate of blue light reaches more than 97%. Experiments have proved that if the blocking rate is lower than 97%, the effect of protecting the eyes is not obvious. Therefore, it is very important to choose anti-blue light glasses and buy authentic products.
