Discussion
Consider the following statements about S cones.
1. They constitute only a few per cent of the cone population.
2. They contribute very little to the perception of brightness.
3. They are the most numerous cone type in the retina.
Answer: A
The first two are correct and follow from the retinal anatomy. The third reverses the position, since the L and M cones together account for the great majority of the cones. S cones number only a few per cent of the total.
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