- complete color blindness
- Severely deficient color perception, typically with monochromacy and reduced visual acuity. The atypical form can include normal visual acuity with pseudomonochromacy.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- A visual defect marked by total color blindness in which the colors of the spectrum are seen as tones of white-gray-black.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.