Vision standards for infants and children With reference to professional information, it is generally believed that the retina of newborn infants is delicate and can only know the near-eye manual. 1 year old has a vision of about 0.2, 2 to 3 years old has a vision of 0.4 to 0.5, 4 years old children should have a vision standard of 0.6, 5 to 6 years old children should have a vision standard of 0.8, and 6 years old and above children should have a vision standard of 1.0. At this stage, the retina is not well developed, and the ability to resist various kinds of external light damage is poor. Therefore, special attention should be paid to the protection of children’s vision from 3 to 7 years old, and it is generally considered that at the age of 12, children’s eyes are gradually developing soundly. How light damages the retina Clinical cases of solar eclipse retinopathy occur, indicating that light can damage the retina. Retinal photodamage is photochemical damage. Medical researchers have used a variety of experimental approaches, using damage models with different irradiation intensities, distances and times, to discover the histopathological characteristics of visible light damage to the retina, which manifests as degenerative degeneration of the photoreceptor cell layer. It was confirmed that: UV light of 300 nm at a dose of 4 kj/m2 and 35 seconds duration can cause retinal damage in mammals; yellow or green light of more than 1 mW directly into the fundus is likely to cause damage, and if the power exceeds 5 mW, temporary exposure can cause permanent retinal functional damage; blue light with an average light intensity of 2500 Lux at 400-440 nm was used to induce damage to the mouse retina. 20 to 80 mW of low-energy 532 nm light at a certain distance and duration of exposure can produce irreversible damage to the retina. The biological effects and damage characteristics of different wavelength light sources irradiating the retina are also obviously different. UV and far-infrared light are easy to damage the cornea, visible light and near-infrared light are easy to damage the retina: longer wavelength near-infrared light mainly damages the retinal pigment epithelium, near-ultraviolet light damages both the retinal pigment epithelium and the photoreceptor cell layer, while yellow-green light mainly damages the photoreceptor cell layer because yellow-green light waves are mainly absorbed by The yellow-green light mainly damages the photoreceptor layer because the yellow-green light waves are mainly absorbed by the optic violet, and the outer segmental disc membrane of photoreceptor cells contains a large amount of optic violet. Blue light does not only damage the photoreceptor cells of the restricted retina, but also causes damage to all layers of the retina. The intensity of the burn is determined by the power density, which is proportional to the exposure time and power, and inversely proportional to the retinal spot size. In summary, the degree of damage to the retina is closely related to wavelength, energy, spot size, distance, and exposure time. The higher the power, the stronger the energy, and the longer the exposure time, the greater the danger.