A DOT-compliant helmet:

Question

The belief that a helmet will restrict a wearer's vision is misguided. Any helmet that meets U.S. Department of Transportation (DOT) standards will allow the wearer to see as far to the sides as is necessary for safe riding.

Accepted Answer

Will allow you to see adequately to both sides.

Answer

Will severely restrict your ability to see.

Answer

Will prevent you from turning your head.