Which option lists the correct proximal vergence value?

Which option lists the correct proximal vergence value?

• A. 2.00 D
• B. 0.50 D
• C. 4.00 D
• D. 6.00 D

Answer: (C)

Proximal vergence is the portion of the vergence response that is driven by the perception that the target is near, independent of the actual focusing demand. In standard ABV practice, this proximal component is taken as about 4 diopters, reflecting typical near-distance cues that push the eyes to converge even before accommodation fully drives it. Therefore, the proximal vergence value is 4.00 D. The smaller values are not enough to represent the proximal drive, and the larger value exceeds the usual proximal contribution used in these questions.

Proximal vergence is the portion of the vergence response that is driven by the perception that the target is near, independent of the actual focusing demand. In standard ABV practice, this proximal component is taken as about 4 diopters, reflecting typical near-distance cues that push the eyes to converge even before accommodation fully drives it. Therefore, the proximal vergence value is 4.00 D. The smaller values are not enough to represent the proximal drive, and the larger value exceeds the usual proximal contribution used in these questions.