In the context of brain injury, the loss of the same side of the visual field in both eyes is known as?

In the context of brain injury, the loss of the same side of the visual field in both eyes is known as?

• A. Anopia
• B. Homonymous hemianopsia
• C. Monocular diplopia
• D. Ptosis

Answer: (B)

When brain injury affects the visual pathways after the optic chiasm, you can lose the same half of the visual field in both eyes. This pattern is called homonymous hemianopsia. The key idea is that the deficit stays on the same side in both eyes because the fibers after the chiasm carry information from the opposite visual field. So a lesion on the right side of the brain (in the optic radiations or occipital cortex) produces a left homonymous hemianopsia, while a left-brain lesion produces a right one. Macular vision can be spared in some cases due to dual blood supply to that area, but the general rule remains that post-chiasmal damage causes a contralateral half-vision loss in both eyes. Other terms like anopia describe broader or different kinds of vision loss, monocular diplopia is double vision in one eye, and ptosis is drooping of the eyelid.

When brain injury affects the visual pathways after the optic chiasm, you can lose the same half of the visual field in both eyes. This pattern is called homonymous hemianopsia. The key idea is that the deficit stays on the same side in both eyes because the fibers after the chiasm carry information from the opposite visual field. So a lesion on the right side of the brain (in the optic radiations or occipital cortex) produces a left homonymous hemianopsia, while a left-brain lesion produces a right one. Macular vision can be spared in some cases due to dual blood supply to that area, but the general rule remains that post-chiasmal damage causes a contralateral half-vision loss in both eyes. Other terms like anopia describe broader or different kinds of vision loss, monocular diplopia is double vision in one eye, and ptosis is drooping of the eyelid.