Watts/cm2=Irradiance for CW lasers
Joules/cm2=Radiant Exposure for pulsed lasers
MPE=Maximum Permissible {Safe}Exposure(W(J/s)/cm2 or J/cm2)
Exposure times different for visible , IR, UV beams
OD=log quantity of exposure/MPE
http://www.pro-lite.co.uk/File/laser_safety_standards.php
VLT=Visible light transmission(% in units)
Ensure eyewears VLT is adequate
Google VS Spectacles(glasses)
