Why are we normally unaware of the blind spot in our vision?
A) Light does not normally fall on the blind spot.
B) Our brains "fill in" the missing visual information for us.
C) Despite the name, the blind spot does not actually prevent light in our visual field from being detected.
D) The blind spot is only an issue in very low light conditions.
Answer: B
Rationale: Because the optic nerve connects to the back of the eye it creates an area in the retina with no rods or cones, called the optic disc. The result is a blind spot—a space in the retina that lacks photoreceptors. The brain however, "fills in" the missing part of the visual field with what it expects to be there.
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