Are 9.9 yuan anti-blue glasses useful?

It's useless. According to relevant data, the blue-light glasses on the market at present have little protection in front of the blue-light band that will cause harm to the eyes. Experts believe that blue light below 440 nm may cause harm to eyes under high intensity and long-term irradiation, while the peak spectrum of blue light in most lighting and electronic products is concentrated at 450-460 nm, so it is not necessary to wear blue glasses in daily life. And according to the test of relevant units, it shows that blue glasses in 9.9 yuan and 99 yuan can't protect blue light below 440 nm. Therefore, in the absence of scientific explanation for the relationship between blue light and eye fatigue, many studies have also pointed out that blue light glasses can not alleviate the symptoms of eye discomfort caused by watching the screen for a long time, but the wrong protection will lead to color cast and aggravate eye fatigue.