The retinal optic disk is
a. a region within retina that has the best visual acuity.
b. where the rods are most densely packed.
c. where the cones are most densely packed.
d. where axons leave the eye and join the optic nerve.
e. where visual signals begin to diverge laterally.
Question 2
The explanation for the blind spot in our visual field is that
a. the lens cannot focus all of the visual field onto the retina.
b. blood vessels collect together and enter the eye at the blind spot.
c. rods are less sensitive to light than are cones.
d. retinal cells die with age and overuse, resulting in blind spots.
e. there are no photoreceptors in the retina where the axons exit the eye.
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