Which statement best defines homonymous hemianopsia?

• A. A pupillary abnormality associated with CVA where vision is lost on the same side of each eye.
• B. Loss of color vision in one eye.
• C. Complete blindness in one eye.
• D. Double vision in both eyes.

Answer: (A)

Homonymous hemianopsia is a brain-based visual field loss where the same half of the visual field is missing in both eyes. It typically results from a lesion behind the optic chiasm—often after a stroke affecting the optic radiations or occipital cortex—so the eyes themselves can see, but half of the field in each eye is lost.

The statement that describes vision loss on the same side of each eye best captures this concept. It emphasizes that the deficit is in the same hemispheric field in both eyes, which is what defines homonymous hemianopsia. The other options describe problems rooted in the eye or optic nerve (loss of color vision in one eye), complete monocular blindness (loss in one eye due to optic nerve or retinal disease), or diplopia (double vision from eye misalignment), none of which reflect the brain-generated, field-wide loss seen in this condition.