High-energy blue light stimulates cells with naked eyes, activates apoptosis genes, and signal transduction leads to changes in protein and enzymes in human eyes, leading to cell degeneration and death. Prolonged exposure to high-energy blue light can also burn photoreceptor cells on the retina. Just as our skin is burned by ultraviolet rays in strong sunlight, the superficial cells of our skin are burned and swollen. (David Asher, North? Exposure (American TV series)) Now, for the educational effect, the size of the 55-inch to 65-inch, 70-inch or even larger whiteboard is getting bigger and bigger. This makes our eyes receive more blue light energy, which is more harmful to our eyes.
We know that the general size of a classroom is 6.3*9.0, and it is stipulated that it should not exceed 8.5 from the blackboard to the last line. The most suitable viewing distance for eyes such as TV and electronic whiteboard is twice that of electronic screen. For example, a 70-inch electronic whiteboard becomes 178 cm after converting inches into centimeters, and the viewing distance is twice that of 70 inches, that is, the electronic whiteboard is 356 cm and more than 3.5 meters.
Moreover, the illuminance of human eyes and electronic whiteboard is inversely proportional to the square of distance. The closer to the whiteboard, the stronger the light, and the brighter the whiteboard we see. Therefore, the students in the front row will be brighter than the students in the back row, and the blue light of the electronic whiteboard will be stronger, and it will be more conspicuous after 7 ~ 8 hours of irradiation. Sometimes I am called by the teacher to write the answers on the blackboard. This is the length of only one arm on the electronic whiteboard. The eyes on the electronic whiteboard are as long as 30 cm, and the brightness has increased several times, which will hurt the eyes more seriously. (David Asher, North? Exposure (American TV series) People's eyesight usually becomes stable in adulthood.
Therefore, for middle school students, he is still a minor, and it is not good to only use his eyes at ordinary times. He will also be exposed to blue light in class, and his myopia will become higher and higher. (David Asher, North? In order to alleviate the visual fatigue caused by electronic whiteboard, students can find the protective effect of blue glasses, reduce the energy of blue light, stimulate our eyes and prevent myopia from deepening.