Discussion
Assertion (A): The Ishihara test does not grade the severity of a deficiency.
Reason (R): It is designed to separate normal from deficient rather than to measure degree.
Answer: B
Both are true and the reason gives the design intention, and an anomaloscope is needed for that. Screening and diagnosis are different tasks. An anomaloscope is needed for classification. Screening separates normal from deficient only.
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