Proximal vergence refers to which component of vergence?

Proximal vergence refers to which component of vergence?

• A. A voluntary vergence component driven by perceived distance of a target
• B. A reflexive vergence driven by disparity
• C. A response to blur
• D. The same as fusional vergence

Answer: (A)

Proximal vergence is the part of vergence that is guided by how far we perceive the target to be. It uses distance cues to drive eye alignment, so the eyes converge when something is perceived as nearer and diverge as it’s seen as farther, even if there isn’t a strong retinal disparity. This makes it distinct from fusional (disparity-driven) vergence, which responds to differences between the images on the two retinas, and from accommodative vergence, which is tied to blur and the focusing response. In short, proximal vergence is the distance-based, cue-driven component that helps maintain single vision as the target’s apparent distance changes.

Proximal vergence is the part of vergence that is guided by how far we perceive the target to be. It uses distance cues to drive eye alignment, so the eyes converge when something is perceived as nearer and diverge as it’s seen as farther, even if there isn’t a strong retinal disparity. This makes it distinct from fusional (disparity-driven) vergence, which responds to differences between the images on the two retinas, and from accommodative vergence, which is tied to blur and the focusing response. In short, proximal vergence is the distance-based, cue-driven component that helps maintain single vision as the target’s apparent distance changes.