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Protan defect

Hereditary red-green color vision defects manifest mostly in males; the condition is not accompanied by ophthalmologic or other associated clinical abnormalities. Most individuals with protanomalous and deuteranomalous color vision defects (i.e., anomalous trichromats) have no problems in naming colors; some males with mildly defective red-green color vision may not be aware of it until they are tested. Individuals with dichromatic color vision defects (i.e., dichromats) are more proficient in deciphering texture camouflaged by color than observers with normal red-green color vision. Among individuals of northern European origin, about 8% of males and 0.5% of females have red-green color vision defects; these defects are less frequent among males of African (3%-4%) or Asian (3%) origin. [from GeneReviews]

MedGen UID:
Concept ID:
Disease or Syndrome


A malignant tumor at the original site of growth. [from NCI]

MedGen UID:
Concept ID:
Finding; Neoplastic Process

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