Because of the characteristic of laser, it can make energy highly concentrated in space and time, Through the eye’s refracting media that focusing on retina to form an image, the incident energy density on retina can be 10000 times higher than the incident energy density on cornea. The monochromaticity of laser is good, the chromatic aberration is small on the ocular fundus. This features can cause the damage of cornea and retina by very low laser radiation.
UV Laser from 180 – 400nm, Cornea, Lens
Visible Laser from 400 – 700nm, Retina, Choroid
NIR Laser from 700 – 1400nm, Retina, Choroid, Lens
FIR Laser above 1400nm, Cornea