Imagine that biologists have discovered an animal that has eyes very similar to human eyes,but that the only receptor cells in the retina are rods; there are no cones.What would you expect about this animal's vision,based on what is known about human vision

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Quizplus · Accepted Answer

Color vision is mediated by cones; thus, a lack of cones would indicate no color vision. Moreover, since this animal has only rods and no cones, it would have greater sensitivity to low levels of light and be better equipped to see in low illumination. However, its ability to distinguish fine details would be limited because rods are not concentrated in the fovea; thus, this animal may have poorer visual acuity than humans. Finally, the fact that it has only rods does not necessarily imply that it would have poor peripheral vision.

Imagine That Biologists Have Discovered an Animal That Has Eyes