What increases during accommodation?

During accommodation, the primary adjustment is made to allow the eye to focus on near objects. This process involves the ciliary muscles contracting, which causes the zonules of Zinn to relax. As the tension on the zonules decreases, the lens becomes more rounded due to its inherent elasticity.

The anterior curvature of the lens increases during this process, leading to a more convex shape. This increase in curvature is crucial for raising the refractive power of the lens, allowing for clear vision at shorter distances.

In contrast, options such as anterior chamber depth and lens zonule tension change in the opposite direction or remain relatively stable during accommodation. The anterior chamber depth actually decreases as the lens bulges forward. Understanding these dynamics helps clarify the physiological mechanisms involved in focusing and how they contribute to visual acuity at different distances.