Timothy's vision is a focus of interest for many ophthalmologists.He is able to see well when there is low illumination but not so well when there is a lot of light,for instance,if he is outdoors during the day.He is also unable to detect most colors during the day.Which poorly-functioning structure of the eye is most likely causing Timothy's unusual vision?
A)rods
B)cones
C)optic nerve
D)sclera

Question

Quizplus · Accepted Answer

Timothy's vision is consistent with a dysfunction of the cones in his retina. Cones are responsible for color vision and work best in bright light. This would explain why Timothy has difficulty with color perception during the day and outdoors in bright light. On the other hand, rods are responsible for vision in low-light conditions, and their dysfunction would result in difficulty seeing in low-light environments. The optic nerve and sclera are not directly involved in visual perception.

Timothy's Vision Is a Focus of Interest for Many Ophthalmologists