visor (n.)

c. 1300, viser, "front part of a helmet," from Anglo-French viser, Old French visiere "visor" (13c.), from vis "face, appearance," from Latin visus "a look, vision," from past participle stem of videre "to see" (from PIE root *weid- "to see"). Spelling shifted 15c. Meaning "eyeshade" is recorded from 1925.