Question

question 34 (1.7 points)
the blind spot of the eye is caused by _________.
a) an absence of photoreceptors where the optic nerve le
b) an absence of cones in the foveae
c) more rods than cones within the retina
d) the macula lutea interrupts the nerve pathway

Explanation:

The blind spot in the eye occurs where the optic nerve exits the retina. At this location, there are no photoreceptors (rods and cones) to detect light.

• Option A: Correct. The absence of photoreceptors where the optic nerve leaves causes the blind spot.
• Option B: Incorrect. The foveae have a high concentration of cones, and their absence there is not related to the blind spot.
• Option C: Incorrect. The ratio of rods to cones in the retina is not the cause of the blind spot.
• Option D: Incorrect. The macula lutea is involved in central vision and does not interrupt the nerve pathway to cause a blind spot.

Answer:

A. an absence of photoreceptors where the optic nerve le