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 cones; there are no rods. Based on what is known about human vision you might expect that this animal would have
A) poor visual acuity
B) poor peripheral vision
C) poor vision in bright illumination
D) no color vision

Question

Quizplus · Accepted Answer

Cones are responsible for color vision and function well in bright light, but they are less sensitive to low light levels compared to rods. Since rods are absent, the animal would likely have poor peripheral vision, which is typically mediated by rods.

Imagine That Biologists Have Discovered an Animal That Has Eyes