A pattern of visual field loss that describes the same relative location in both eyes is known as a:

A pattern of visual field loss that describes the same relative location in both eyes is known as a:

• A. Bitemporal defect
• B. Homonymous defect
• C. Junctional defect
• D. Concentric defect

Answer: (B)

When the same portion of the visual field is lost in both eyes, it points to a lesion after the optic chiasm affecting the contralateral visual pathways. This pattern, where the affected area is in the same relative location in each eye, is called a homonymous defect. For example, a lesion on one side of the retrochiasmal pathway (behind the chiasm) typically produces left or right field loss in both eyes, matching on the same side. This helps distinguish it from other patterns. A bitemporal defect involves the outer (temporal) fields of both eyes and suggests chiasmal involvement rather than a post-chiasmal lesion. Junctional defects and concentric patterns describe different, more localized configurations of loss that don’t manifest as the same-side field loss in both eyes.

When the same portion of the visual field is lost in both eyes, it points to a lesion after the optic chiasm affecting the contralateral visual pathways. This pattern, where the affected area is in the same relative location in each eye, is called a homonymous defect. For example, a lesion on one side of the retrochiasmal pathway (behind the chiasm) typically produces left or right field loss in both eyes, matching on the same side.

This helps distinguish it from other patterns. A bitemporal defect involves the outer (temporal) fields of both eyes and suggests chiasmal involvement rather than a post-chiasmal lesion. Junctional defects and concentric patterns describe different, more localized configurations of loss that don’t manifest as the same-side field loss in both eyes.