Discussion
Match each colour vision test with what it does.
List I
A. Ishihara plates
B. Farnsworth Munsell 100 hue
C. Anomaloscope
D. D-15 panel
List II
1. precise diagnosis and classification
2. rapid screening for red green deficiency
3. separating mild from severe deficiency
4. grading discrimination ability
Answer: A
Screening, grading and diagnosis are three separate purposes. Using a screening test to grade an observer is a common and misleading error. Each test answers a different question. Screening, grading and diagnosis are distinct tasks.
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