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Question

In mammalian eye, the 'fovea' is the center of the visual field where


A
More rods than cones are found
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B
High density of cones occur but has no rods
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C
The optic nerve leaves the eye
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D
Only rods are present
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Solution

The correct option is A High density of cones occur but has no rods
The fovea centralis is a small, central pit composed of closely packed cones in the eye. It is located in the center of macula lutea of the retina. It is responsible for sharp central vision which is required during driving and reading. This region has a high density of cones but rods are absent. The central fovea consists of very compact cones, thinner and more rod-like in appearance than cones found elsewhere. Since the fovea does not have rods, it is not sensitive to dim lights. So, the correct answer is option B.

Biology

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