Edwin is able to see normally in low-light conditions and demonstrates a normal ability to detect movements in his periphery. However, he has great difficulty recognizing different colors. He sees the world mostly in shades of gray. Which of the following structures are either impaired or not present in Edwin's eyes?

Question

Quizplus · Accepted Answer

Cones are responsible for color vision. Edwin's difficulty in recognizing colors suggests that his cones are impaired or not present.

Edwin Is Able to See Normally in Low-Light Conditions and Demonstrates