Note

Congenital: Male > female; typically X-linked → predominantly red–green color abnormalities.

Acquired: Male = female → predominantly blue–yellow color abnormalities.

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Code: Dyschromatopsia often reveals itself at traffic lights: the patient has difficulty distinguishing red from green and is left wondering what the yellow light is supposed to mean!

Fill in the Blank

The most common color spectrum abnormality in acquired dyschromatopsia is .

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