How to choose glasses to protect eyes from laser correctly?

Why should you keep your eyes away from the laser? The damage and damage degree of laser to human tissues are mainly determined by the wavelength of the laser, light source type, emission method, incident angle, radiation intensity, exposure time, and the characteristics of biological tissues and the size of the spot. The target organs that laser damage the human body are mainly eyes and skin. When the eye is in a horizontal laser beam, the exposure intensity of the retina is 200,000 times greater than that of the cornea. Generally, visible light and short-wave infrared radiation are referred to as the retinal damage bands of optical radiation, because the beams of these bands can be highly focused on the retina and are mostly located in the macular region of the central visual area. At present, most of the lasers emitted by lasers have the most harmful effects in the visible light band below 500nm. The typical manifestations of injury are edema, congestion, hemorrhage, and even retinal displacement, perforation, and finally lead to the formation of central blind spots and scars, and a sharp decline in vision.