Meaning of protanomaly

prot•a•nom•a•ly

Pronunciation: (prōt"n-om'u-lē), [key]
— n. Ophthalm.
  1. a defect of vision characterized by a diminished response of the retina to red.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.