Yeah, I've been hit in the eye many many with lasers and I don't have a problem. Here, I found this on a website a while ago. Gives you a basic understanding.
WARNING
Extra precautions must be taken because of a laser beam's intense concentrated energy. Among other factors, the hazards presented depend on the power density, the frequency of the beam, and the time of exposure. Guidelines have established the classification of lasers.
A brief description of the classification is as follows:
Class I: Low-power beam. Not known to produce any biological injuries
to the eye or skin.
Class II: Reserved for visible-light lasers only. They are limited to less than 1 milliwatt output. Eye damage will result if stared into for longer than 1 second.
The normal blink response of the human eye will provide protection. Eye damage will occur if the beam is viewed directly by optical instruments. Direct (specular) reflection, as from a mirror, should be considered to be the direct beam.
Diffuse reflection of the light may be viewed.
Class III: Instantaneous eye damage will occur if exposed to the direct beam.
Class IV: Both direct exposure or direct and diffuse reflections will produce eye damage. Exposure of the skin to the beam is hazardous. The beam is considered to be a fire hazard.
Now, about the class three... my eye's aren't messed up, and I've messed around and beamed myself right in the eye before many times. Same with the class two. But, others may not be as lucky as me. Sooo... don't try this at home. :lol:
Anyway, I know this isn't what you asked for, but I figured these links I found for you might help anyway.
https://circuitos.tripod.cl/schem/r55.gif
https://circuitos.tripod.cl/schem/r94.gif
https://www.aaroncake.net/circuits/laserxmt.htm
https://www.electro-tech-online.com/custompdfs/2004/06/20mrvr2.pdf
Hope they help! Though... you didn't ask for it. :lol: See ya.
Rain