Eye Protection is MANDATORY!
All goggles and safety glasses must have a hard lens and must meet ANSI Z87.1 standards. There must be a full seal around the eyes and must have a safety strap to prevent them from falling off. Goggles with soft lenses or shop glasses without a full face seal are not acceptable. If you can insert the eraser-end of a pencil between your face and your protection, it does not offer a "full seal" and is not acceptable.
Goggles and glasses with anti-fog lenses are highly recommended. Clearing fog during combat operations must be done w/o removing your eye protection. If you remove your eye protection during an operation, you will be asked to leave.
Many types of eye protection are available from vendors like - http://www.safetyglassesusa.com. Chose carefully, do your homework and select the safest eye protection you can.