At night,when one looks at a star directly,the image of the star hits the fovea of the retina and it is difficult to see it clearly.Why does this phenomenon occur?
A)The fovea is densely packed with rods.
B)The fovea is rod-free.
C)The fovea is adjacent to the blind spot.
D)The cells in the fovea are hyperpolarized.

Question

Quizplus · Accepted Answer

The fovea is rod-free, meaning that only cone cells are present in this area. Cone cells are responsible for color vision and high visual acuity, but they function best in bright light. In dim light, the pupil dilates to let in more light, which causes blurred vision when looking directly at a star due to the cones not being fully adapted to low light conditions.

At Night,when One Looks at a Star Directly,the Image of the Star