A person with a defect in color vision (color blindness) can be classified based on the defect in color vision and other features.
(1) color(s) affected
(2) inheritance pattern
(3) number of primary colors seen ( 2 or dichromatic, 3 or trichromatic)
(4) severity of defect
Suffix term for number of colors seen:
(1) anomaly (indicated as " ' "): 3 of 3 colors seen (defective but present to some extent)
(2) anopia (indicated as " - "): 2 of 3 colors seen (associated with absent receptors)
Number of Colors Seen
moderate to severe
• X-linked recessive inheritance usually affects males with unaffected parents. Daughters may be affected if father affected, but sons of an affected father would not be unless mother is a carrier.
• Autosomal dominant should affect at least one parent and half of the children.
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