Protanomaly

This code represents a mild form of red-green color blindness where the red-sensitive cones in the retina are present but have an abnormal photopigment, causing red, orange, and yellow to appear greener and less vivid. Individuals with this condition have difficulty distinguishing shades of red and green, often perceiving them as similar.

Use this code when documentation specifies a diagnosis of protanomaly, indicating a specific type of anomalous trichromacy affecting red perception. This diagnosis is typically made through color vision tests such as the Ishihara plates or anomaloscope.

• Differentiate from protanopia (complete absence of red cones), which is coded separately.
• Ensure the documentation clearly specifies "protanomaly" and not a general "red-green color blindness."
• Do not use for other forms of anomalous trichromacy like deuteranomaly or tritanomaly.