The adjustable green laser pointer can change the distance of the light

Invisible light with wavelengths other than near infrared can damage the outside of the eye. Ultraviolet rays (180nm to 400nm) can cause damage to the lens and cornea. Mid-infrared rays (IR-B, 1400nm to 3000nm) can pass through the surface and cause cataracts. Far infrared rays (IR-C, 3000 nm to 1 mm) can cause damage to the outer surface of the eye and cornea. In addition, we must not forget the existence of secondary beams reflected at different angles. The secondary beam is located on or near the work surface. This is the specular reflection of the main beam on various surfaces. The intensity of the secondary beam is weaker than the total output of the laser emission, but it is strong enough to harm the eyes. This situation should also be taken into consideration when installing the laser.