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."
3.
pl. A kind of goggles, used to protect the eyes form glare, etc.
... Observe the wig, of a dark hue but indescribable colour, for if it be naturally brown, it has acquired a black tint by long service, and if it be naturally black, the same cause has imparted to it a tinge of rusty brown; and remark how very materially the great blinker-like spectacles assist the expression of that most intelligent face. Seriously speaking, did you ever see a countenance so expressive of the most hopeless extreme of heavy dulness, or behold a form so strangely put together? He is no great speaker: but when he does address ... — Sketches by Boz - illustrative of everyday life and every-day people • Charles Dickens