Lasers are harmful to the eyes.
Laser wavelength and eye damage: in the laser damage, to the most serious damage to the eyes in the organism. Wavelengths in the visible and near-infrared light laser, eye refractive medium of low absorption, high transmission rate, and refractive medium of focusing ability (i.e., convergence) is strong.
High-intensity visible or near-infrared light into the eye can pass through the refractive medium of the human eye, the accumulation of light on the retina. At this time on the retina laser energy density and power density increased to thousands or even tens of thousands of times, a large amount of light energy in an instant in the retina, to the retina photoreceptor cell layer temperature rises rapidly, so that the photoreceptor cell coagulation degeneration and necrosis and the loss of photoreceptor role.
The protein coagulation and denaturation caused by the overheating of the laser on the photoreceptor cells is an irreversible damage. Once the damage is done, it can cause permanent blindness in the eye.
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Extended information: Lasers have a strong ability to focus light, strong directionality and concentration of beams, and when the child's eyes look directly at the laser pointer when the laser beam is emitted, the child will not be able to see the laser due to the delicate eye tissues. When the child's eyes look directly at the laser beam from the laser pointer, the child's eye tissue is delicate, there is a risk of irreparable damage. Li Shuangle, director of ophthalmology at a hospital in Zigong, said in an interview with the West China Metropolis Daily reporter that a laser pointer directed at the eye may cause damage to the retina and macula, and may also directly lead to a loss of vision. More serious consequences are after the damage to the eye's macula, resulting in permanent eye damage. /baike.baidu.com/item/%E6%BF%80%E5%85%89/130230#5 "target="_blank "title="Baidu Encyclopedia - Laser">Baidu Encyclopedia --laser