Incongruous visual field defects are most often produced by lesions located in which part of the visual pathway?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Incongruous visual field defects are most often produced by lesions located in which part of the visual pathway?

Explanation:
Incongruous visual field defects arise when a lesion affects one eye’s pathway without producing a mirrored effect in the other eye. This most often occurs before the optic chiasm, in the optic nerve or retina, so the defect is monocular or unequal between eyes. Lesions at or behind the chiasm tend to produce defects that are the same in both eyes (homonymous and typically congruent) because the affected fibers represent the same visual field in each eye after the chiasm. Therefore, the best choice is a lesion anterior to the optic chiasm.

Incongruous visual field defects arise when a lesion affects one eye’s pathway without producing a mirrored effect in the other eye. This most often occurs before the optic chiasm, in the optic nerve or retina, so the defect is monocular or unequal between eyes. Lesions at or behind the chiasm tend to produce defects that are the same in both eyes (homonymous and typically congruent) because the affected fibers represent the same visual field in each eye after the chiasm. Therefore, the best choice is a lesion anterior to the optic chiasm.

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