This is an excellent resource explaining the need and types of eye protection needed for various laser/light devices:
OSHA also provides certain guidelines as best/safe practice for using eye protection when having laser surgery:
http://www.osha.gov/SLTC/etools/hospita ... tml#Lasers
The American National Standard Institute (ANSI) Z136 series of laser safety standards covers lasers in medical settings and provides guidance for the safe use of lasers for diagnostic, cosmetic, preventative and therapeutic applications in healthcare facilities. These guidelines are considered to be the standard for safe practice in the industry and include solutions such as:
Use laser protective eyewear that provides adequate protection against the specific laser wavelengths being used. All laser eyewear must be marked with Optical Density (OD) and laser wavelength.