for the armored part of a helm that can be lifted, see visor (armor).
for sun visors or capless hats that only consist of an eyeshade and a strap around the head, see visor cap
for the type of cyberpunk-ish visors that are worn like glasses, see head-mounted display
for the type of glass/plastic visors incorporated in helmets seen in mecha or worn by sci-fi characters such as Samus Aran's and Master Chief's, see assault visor