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.
Answer: d. where axons leave the eye and join the optic nerve.
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