Blinker

Part of speech: noun (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.