Why is visual acuity greater in the fovea than in the periphery? a) Compared to

Question

Why is visual acuity greater in the fovea than in the periphery?

a) Compared to the periphery, photoreceptors are closer together in the fovea and receptive fields of ganglion cells contain more photoreceptors.
b) Compared to the periphery, photoreceptors are closer together in the fovea and receptive fields of ganglion cells contain fewer photoreceptors.

c) Compared to the periphery, photoreceptors are further apart in the fovea and receptive fields of ganglion cells contain more photoreceptors.

d) Cones can detect colour
e) Cones are more sensitive to light than rods

Explanation / Answer

In the fovea including humans, the ratios of ganglion cells to photoreceptors is about 2.5; almost each and every ganglion cell receives data from a single cone, and each cone feeds onto between nearly 1 and 3 ganglion cells. Thus, the acuity of foveal vision is limited only by the density of the cone mosaic, and the fovea is the area of the eye with the maximum sensitivity to fine details.

Therefore, compared to the periphery, photoreceptors are closer together in the fovea and receptive fields of ganglion cells contain more photoreceptors.

Hence, th correct answer is the option (a).

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