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Meaning of protanopia

pro•ta•no•pi•a

Pronunciation: (prōt"n-ō'pē-u), [key]
— n. Ophthalm.
  1. a defect of vision in which the retina fails to respond to red or green.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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