It is a rare type of anomalous trichromatic vision in which the third, blue-sensitive, cones have decreased sensitivity. Less than about 0.01% of people affected by it. However, it is known that reds and greens are unaffected, and some yellows may be visible on the lower end of the spectrum with this disorder.
Normal Color Vision Tritan Color Vision
What is known about protanomaly and deuteranomaly suggests that tritanomaly is caused by defective S photopigment. It is known that persons affected by this condition have difficulty distinguishing between yellow and blue.
Normal Color Vision Tritan Color Vision
Normal Color Vision Tritan Color Vision
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