Discussion
Rod intrusion into a colour match occurs when
Answer: A
Correct answer: the luminance level falls low enough for rods to contribute
At mesopic levels the rods are still responding, and since they have a spectral sensitivity of their own their signal disturbs the cone-based match. A match set at a low light level can therefore fail at a higher one. Assessment is carried out at a specified and adequate illuminance to keep the rods out of it.
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