Question

although she is normally not aware of its existence, ingrid discovers that she has a blind spot in her vision by closing one eye and focusing on a fixed point. what explains why ingrid has this blind spot in her vision? she suffers from retinal degeneration. there are only rods at the optic disc, which do not provide sufficient visual information. no photoreceptors are located where the optic nerve leaves the eye. there is insufficient light to activate her rods at the optic disc. question 60 (1 point) listen which is the correct order of structures as visual information travels from the eye to the visual cortex? optic chiasm; occipital lobe; lateral geniculate nucleus lateral geniculate nucleus; optic chiasm; occipital lobe optic chiasm; lateral geniculate nucleus; occipital lobe lateral geniculate nucleus; occipital lobe; optic chiasm

Explanation:

• First question: The blind spot exists because there are no photoreceptors (rods and cones) at the optic nerve exit point (optic disc). Retinal degeneration would cause more widespread vision problems. The optic disc has no rods (or cones). Insufficient light is not the cause of the blind - spot.
• Second question: Visual information travels from the eye, crosses at the optic chiasm, then goes to the lateral geniculate nucleus (a relay station in the thalamus), and finally to the occipital lobe (visual cortex).

Answer:

• First question: No photoreceptors are located where the optic nerve leaves the eye.
• Second question: optic chiasm; lateral geniculate nucleus; occipital lobe