susceptible to damage by laser light. Light enters through the transparent layers of the cornea and then is focused by the lens onto the retina. The eye in essence intensifies light energy, particularly the visible and the near-infrared wavelengths, in some cases as much as 100,000 times. For example, if there is a 1 mW/cm2 irradiance of light entered the eye, it can be intensified on the retina
to an irradiance of 100 W/cm2. The fovea on the retina is a small area (~ 4% of retina) that is responsible for our acute and color vision, so that damage to this portion of the eye can result in a serious loss of sight.