The basic function on the eye is to receive information as light rays, pass these pieces of information through the optic nerve to the brain for “processing” the brain then sends back processed information then you can subsequently appreciate what you had set your eyes on literarily speaking .
Since the eyes need light to function, it only makes sense that light can be used to correct various eye problems whether physiologically or surgically. Lasers are basically excited tiny particles of light (photons) vibrating at the same wavelength and are directional therefore they are coherent. Your flash light produces light that is not coherent so the distance it can travel and penetrating power is limited unlike what you have with Lasers. The synchrony of the photons in Lasers gives it penetrating power and ability to travel amazing distances.
In 1946 German Opthalmologist Gerd Meyer Schwickerath used an improvised Laser to seal tears on human retinal tissues the results were amazing and a revolution in the correction of eye defects began .In 1960, Theodore Maiman officially demonstrated how Lasers can be used during eye surgeries and rapidly Lasers therapy became adopted as the procedure of choice in the surgical management of ocular defects
Over time as technology improved, and innovation was brought into Laser development for ocular procedures, different types of Lasers with various characteristics were developed to suite specific purposes during these surgeries on the eye .
We shall briefly look at 5 of these Laser types so perhaps one day when you might need a Laser therapy you will not come across as a green horn