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 location.
C. Blood vessels form a meshwork here and interfere with vision.
D. This area is so heavily pigmented that light rays are absorbed rather than re-fracted.
A
The optic nerve enters the eyeball at this point and contains no photoreceptors.
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