How does endothelial dysfunction affect the lens?

Endothelial dysfunction affects the lens primarily through its impact on the cornea, leading to increased water content. The endothelial cells of the cornea play a crucial role in maintaining the corneal transparency and hydration level by regulating the movement of fluids and nutrients between the cornea and the aqueous humor. When these endothelial cells become dysfunctional, their ability to pump excess fluid out of the cornea is impaired, which causes corneal swelling or edema. This higher water content can lead to visual disturbances, including blurred vision.

In contrast, the other options do not accurately represent the effects of endothelial dysfunction. A more stable lens fit is typically correlated with a healthy ocular surface and proper fit of the contact lenses, not with dysfunction. Enhanced nutrient absorption is not a direct result of endothelial dysfunction and is more related to the corneal surface and overall ocular health. Similarly, visual acuity typically diminishes with increased corneal edema rather than improves as a result of endothelial issues. Thus, the correct answer reflects the primary and direct consequence of endothelial dysfunction on corneal health and its influence on lens clarity.