Accommodative convergence is the portion of vergence driven by which response?

Accommodative convergence is the portion of vergence driven by which response?

• A. The accommodation stimulus
• B. The accommodation response
• C. Disparity-induced vergence
• D. Head tilt-induced vergence

Answer: (B)

Accommodative convergence is the part of vergence that follows the accommodation response—the actual change in the eye’s lens to focus on a near object. When you fixate on something up close, the ciliary muscle adjusts the lens to increase optical power, and the neural system links that accommodation effort to turning the eyes inward. This coupling is what we call the accommodative convergence: the convergence that accompanies the accommodation response as part of the near triad (accommodation, convergence, pupil constriction). It’s not driven primarily by retinal disparity (that’s disparity-driven vergence) and not by head tilt (which invokes vestibular influences). The stimulus to focus may initiate accommodation, but the vergence component associated with that focus change is produced by the accommodation response itself.

Accommodative convergence is the part of vergence that follows the accommodation response—the actual change in the eye’s lens to focus on a near object. When you fixate on something up close, the ciliary muscle adjusts the lens to increase optical power, and the neural system links that accommodation effort to turning the eyes inward. This coupling is what we call the accommodative convergence: the convergence that accompanies the accommodation response as part of the near triad (accommodation, convergence, pupil constriction). It’s not driven primarily by retinal disparity (that’s disparity-driven vergence) and not by head tilt (which invokes vestibular influences). The stimulus to focus may initiate accommodation, but the vergence component associated with that focus change is produced by the accommodation response itself.