Discussion
Match each colour vision condition with its description.
List I
A. Protanopia
B. Deuteranopia
C. Tritanopia
D. Anomalous trichromacy
List II
1. absence of the short wavelength cone
2. absence of the long wavelength cone
3. three cones with one sensitivity shifted
4. absence of the medium wavelength cone
Answer: B
The prefixes prot, deuter and trit refer to the first, second and third cone. The suffix anopia indicates absence and anomaly indicates a shift. The prefixes number the cone types in order. Anopia means absence and anomaly means a shift.
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