Which type of accommodation occurs due to a change in vergence and is considered the second most important component?

Which type of accommodation occurs due to a change in vergence and is considered the second most important component?

• A. Reflex accommodation
• B. Proximal accommodation
• C. Vergence accommodation
• D. Tonic accommodation

Answer: (C)

Vergence accommodation is the type of focusing that changes when your eyes change their vergence. When you converge to look at something nearer, the neural system adjusts the lens power to keep the image sharp on the retina, so the accommodation follows the eye’s vergence, not just blur signals. This cross-link between how the eyes align and how the lens focuses makes vergence accommodation the second most important contributor to accommodation—after the reflex drive from blur. Proximal cues can nudge focus a bit based on perceived distance, but their influence is smaller, and tonic accommodation is simply the baseline level in the absence of a current vergence or blur signal.

Vergence accommodation is the type of focusing that changes when your eyes change their vergence. When you converge to look at something nearer, the neural system adjusts the lens power to keep the image sharp on the retina, so the accommodation follows the eye’s vergence, not just blur signals. This cross-link between how the eyes align and how the lens focuses makes vergence accommodation the second most important contributor to accommodation—after the reflex drive from blur. Proximal cues can nudge focus a bit based on perceived distance, but their influence is smaller, and tonic accommodation is simply the baseline level in the absence of a current vergence or blur signal.