Which retinal region in the right eye receives input from the right eye's temporal visual field?

• A. Nasal retina of the right eye.
• B. Temporal retina of the left eye.
• C. Nasal retina of the left eye.
• D. Fovea of the right eye.

Answer: (C)

Visual field mapping to the retina runs opposite for the field and the retinal location: the temporal visual field is detected by the nasal portion of the retina, while the nasal visual field is detected by the temporal portion of the retina. For the right eye, the right-eye’s temporal visual field is therefore detected by the nasal retina of that same eye. (Fibers from the nasal retina cross at the optic chiasm, but the question is about which retinal region in the right eye receives input from its own temporal field, not about where the signal ends up in the brain.) So the nasal retina of the right eye is the region corresponding to the right eye’s temporal visual field.