Final answer:
Damage resulting in loss of the right temporal visual field and the left nasal visual field indicates a problem in the left optic tract, which processes visual information from the right side of both retinas.
Step-by-step explanation:
If an individual has loss of vision in the right temporal visual field and the left nasal visual field, the location of the damage is most likely to be in the left optic tract. This is because the visual pathways are organized such that the right half of the visual field is processed by the left side of the brain and vice versa. Damage to the left optic tract means that the fibers carrying information from the right side of both retinas are compromised.
The optic nerves from both eyes meet and partially cross at the optic chiasm. Here, the axons from the nasal retina (medial retina) decussate, and so axons carrying information from the right visual field of both eyes cross to the left side of the brain. If the optic chiasm were damaged, we would expect to see a different pattern of vision loss—bitemporal hemianopia. Damage to an optic nerve would result in total vision loss in the corresponding eye, which doesn't match the described loss of visual fields.