Infrared injury

The wavelength of 760nm to 4000000nm occurs in the sun or hot objects, and the long-wave part does not damage the tissue. It can be focused by a lens or a mirror, or it can be dispersed by a prism. The biological effects of infrared are mainly thermal effects. Infrared is easily absorbed by dark objects. High-intensity infrared causes tissue necrosis and protein coagulation. Far-infrared rays can penetrate only 0.5cm to the left of the tissue, and are almost completely absorbed by the cornea and aqueous humor. Near-infrared rays can penetrate the tissues 3 to cm to reach the retina, and are absorbed by pigment in the iris and retina.