Discussion
Colour vision screening is required for colour matching operatives because
Answer: B
Correct answer: a deficient observer may accept a match a normal observer rejects
A person with a colour deficiency sees the world perfectly well but confuses certain pairs, and those confusions are exactly where a metameric mismatch would show. Passing a batch that most customers will see as wrong is the commercial risk, which is why colour matchers are screened and periodically retested.
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