blinder

(noun) blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side. Synonyms: winker, blinker.

(adj) unable to see. Synonyms: blind (vs. sighted), unsighted. Example: "A person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision"--kenneth jernigan."

(adj) unable or unwilling to perceive or understand. Synonyms: blind. Examples: "Blind to a lover's faults." "Blind to the consequences of their actions."

(adj) not based on reason or evidence. Synonyms: blind, unreasoning. Examples: "Blind hatred." "Blind faith." "Unreasoning panic."