Blue light refers to electromagnetic waves with a wavelength of 400 to 500 nanometers. Blue light has higher energy and stronger penetration because of its short wavelength. Therefore, blue light has the ability to penetrate the cornea and lens, causing certain damage to the fundus retina.

Is the mobile phone anti-blue film useful after all? The truth is here.

Most of the mobile phone light sources we use every day are LEDs. Coincidentally, the LED light source is mainly blue light. If the brightness is to be improved, the intensity of blue light should also be improved. In recent years, the development of mobile phone screen brightness is also going high, so blue light is really becoming a big threat to our eyes.

Is it necessary to prevent blue light?

However, when talking about the harm of blue light, don't forget that there are two important indicators: illumination brightness and illumination time.

14 years, the Visual Health Laboratory of China National Institute of Standardization and Wenzhou Medical University conducted a blue light retinal injury experiment. Retinal cells were continuously irradiated with blue light with illumination exceeding 1500 lx for 3 hours, and retinal cells showed decreased vitality and apoptosis.

However, the illuminance of our daily LED lighting generally does not exceed 600 lx, and the illuminance of mobile phone screen does not reach this level.

So you don't need blue light protection? It must be said that for people who use mobile phones for a long time, blue light will still cause visual fatigue, and it is not good to use their eyes too much for a long time.

However, compared with the anti-blue film on mobile phones, Qiushi Laboratory still suggests that we take more reasonable measures to reduce the damage of blue light to eyes, that is, take more rest and use our eyes moderately. Every 20 minutes of continuous use of the mobile phone, it is best to look at the distance for more than 20 seconds and relax your eyes.