What is the meaning of 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

adjective

• Unable to see."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
  • synonyms: blind, unsighted
• Unable or unwilling to perceive or understand.
  • usage: "blind to a lover's faults"; "blind to the consequences of their actions"
  • synonyms: blind
• Not based on reason or evidence.
  • usage: "blind hatred"; "blind faith"; "unreasoning panic"
  • synonyms: blind, unreasoning