Which statement about the lens is NOT true?

The statement regarding the lens diameter increasing with accommodation is not true. When the eye accommodates for near vision, the ciliary muscles contract, which reduces the tension on the zonules (the fibers connecting the ciliary body to the lens). This allows the lens to become more rounded or bulged, increasing its curvature rather than its diameter. The overall power of the lens changes due to this increased curvature, enabling the eye to focus on closer objects. However, rather than increasing in diameter, the lens actually changes its shape to facilitate this adjustment.

In contrast, the other statements are accurate descriptions of the lens's characteristics and functions. The lens extracts nutrients like glucose and oxygen from the surrounding aqueous humor to maintain its transparency and metabolic function. It does utilize anaerobic glycolysis as a primary source of energy for its cells, allowing for continuous maintenance of its structure and clarity. Additionally, the lens contributes to the eye's refractive power, typically around 20 diopters, assisting in focusing light onto the retina.