visor

A visor is part of the front of a helmet that can usually be raised or lowered. Visors shade your eyes from the sun.

The brim of a hat keeps the sun out of your eyes, but the visor of a helmet does an even better job. The visor actually covers your eyes, much like sunglasses. Many motorcycle helmets have a visor, and so do some police helmets and football helmets. As with sunglasses, the visor restricts your vision in some ways, so it's the kind of thing you would only want to use if the sun is blinding.

Definitions of visor
1

n a brim that projects to the front to shade the eyes

Synonyms:
bill, eyeshade, peak, vizor
Type of:
brim
a circular projection that sticks outward from the crown of a hat

n a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face

Synonyms:
vizor
Type of:
armor plate, armor plating, armour plate, plate armor, plate armour
specially hardened steel plate used to protect fortifications or vehicles from enemy fire

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