Blinker

Blink·er

Blinker

n.
  1. One who, or that which, blinks.
  2. A blinder for horses; a flap of leather on a horse's bridle to prevent him from seeing objects as his side hence, whatever obstructs sight or discernment.
    Nor bigots who but one way see, through blinkers of authority.
    — M. Green.
  3. A kind of goggles, used to protect the eyes form glare, etc.