[EricH]

Are paintball headshields ANSI-approved, as required by the Administrative Manual Section 4.3.1? If they are, and you can show that, you should be OK.

If not, however, then you will need to wear ANSI-approved safety glasses along with the headshield if you're going to wear the headshield at all.

Also see this, from the FRC Team Safety Manual:

Eye and Face Protection
There are several forms of eye/face protection available to provide protection from these hazards, including safety glasses with side shields, goggles, and face shields. Inspect equipment for damage each time it is worn. If you wear prescription glasses, and they are not approved safety glasses, you must wear approved safety goggles over them to achieve
adequate protection.
Eye and face protection is required when there is a risk of exposure to the following:
 Flying particles
 Chemical exposure (such as splashes, splatters, and sprays)
Wear non-shaded, ANSI-approved eye protection in the following areas:
 When doing any work on the robot including, grinding, drilling, soldering, cutting, welding, etc.
 at FIRST events:
 Anywhere in the pit area, including walk ways and pit stations
 On the Playing Field
 On the Practice Field
 Any area posted with signs requiring the use of eye protection