What is the location of the lesion in the case of a blind right eye?

In the case of a patient who presents with a blind right eye, the location of the lesion is indicative of the pathway leading from the retina of the right eye to the brain. The right eye has its optic nerve transmitting visual information directly to the brain; therefore, a lesion in the right optic nerve would lead to total loss of vision in that eye.

When assessing visual pathways, the optic nerve carries signals from a specific eye to the brain. If there is a problem with the optic nerve on one side (the right side, in this case), the visual input from that eye cannot be transmitted, resulting in a loss of vision exclusively in the affected eye—leading to complete blindness in the right eye.

The other options refer to different points in the visual pathway that affect vision differently. A lesion at the left optic nerve would lead to blindness in the left eye, while issues at the optic chiasm or left optic tract would typically result in varying forms of hemianopia rather than total blindness in just one eye. Understanding the connections and pathways of the optic nerves helps clarify why damage to the right optic nerve specifically leads to blindness in the right eye.