Cases of electrophthalmia and solar retinopathy occur in clinical practice, indicating that light can damage the retina. A report in the media today about a Xi’an baby Song Song who stared at the shower bar while taking a bath, resulting in macular degeneration blindness, has raised the concern of many parents who have come to the ophthalmology department with their babies in their arms for consultation. So how does bright light damage the retina? Families commonly used light-warming bath bar emits white light, a mixture of light, according to the wavelength of the different points out of the red, orange, yellow, green, green, blue, purple seven wavelengths. The degree of light damage to living tissues and organs is closely related to the wavelength, energy, spot size, distance and exposure time, etc. The wavelength of 400-500NM is blue light, which is high-energy visible light and most likely to damage living tissues and organs. Retinal photodamage belongs to photochemical damage. If the human eye receives long-term exposure, it can cause lens clouding in the eye, and if focused on the retina, it can cause retinal burns, edema in the posterior pole of the retina, and even cause hemorrhagic spots, and in severe cases, the formation of macular fissure, and rapid vision loss or blindness. How to avoid light damage in infants and children? The vision of a newborn baby can only see close to the immediate manual, and the vision is about 0.2 at the age of one year. Children must receive normal stimulation of visible light from birth to complete visual development. Although for mechanical stimuli, the eyes can be protected from damage by frequent blinking, thus protecting vision, for infants and toddlers under 3 years of age, infants and toddlers tend to blink less often consciously when they gaze, which is related to the fact that the neurological function of the brain for blinking action is not very sound. Infants have a lower number of eye blinks per unit of time than adults, resulting in greater intensity of bright light irritation and damage, and the infant lens is not able to filter harmful light, which can easily cause retinal damage. Infants unlike children and adults can unconsciously avoid light, which is caused by the differences in human physiological defense mechanisms at different ages. Therefore, infants under three years of age should avoid prolonged exposure to light-heating baths, heaters, when playing outside to do a good job of shading protection, avoid direct exposure to bright light. Avoid prolonged close viewing of tablet computer games, and pay attention to the flash frequency and distance when taking pictures. If children have visual abnormalities, consult a pediatric ophthalmologist promptly.