At night,faint objects are best seen when not looked at directly.What is the basis of this phenomenon?
A)Rhodopsin is transported away from the fovea at night.
B)Cis-retinal builds up in the fovea at night,and is degraded during the day.
C)Cone photoreceptors are most sensitive in dim light,and few cones are present in the fovea.
D)Rod photoreceptors are most sensitive in dim light,and few rods are present in the fovea.

Question

Quizplus · Accepted Answer

Rod photoreceptors are most sensitive in dim light, and their concentration is highest in the periphery of the retina. The fovea, which is the central portion of the retina responsible for sharp and detailed vision, has fewer rods and is dominated by cone photoreceptors, which are less sensitive to dim light. Therefore, faint objects are best seen when not looked at directly because the peripheral retina, which has a higher concentration of rods, is more sensitive to dim light and better suited for detecting faint objects in low light conditions.

At Night,faint Objects Are Best Seen When Not Looked at Directly.What