If a person had only cone cells in the retina, this would most likely result in

a. an inability to distinguish red from green.
b. an inability to perceive any color at all.
c. difficulty seeing in dim light.
d. difficulty seeing in very bright light.
e. poor perception of detail in the center of the visual field.


C; The rods are capable of responding to very low levels of light, and if you had to depend on your cones alone, you could not see well at night. The cones allow for red, green, and blue color vision (choices a and b) and are concentrated in the center of the visual field (choice e). A loss of pigment cells around the retina would give you problems in dealing with bright light (choice d).

Biology & Microbiology

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