Why is the optic disc considered to be a blind spot?
a. This area does not contain photoreceptors.
b. Light rays are unable to focus on this lo-cation.
c. Blood vessels form a meshwork and in-terfere with vision.
d. This area is heavily pigmented and light rays are absorbed.
A
The optic nerve enters the eyeball at this point and contains no photoreceptors. The other res-ponses are incorrect.
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