Definition
The lens nucleus is the central, densest part of the crystalline lens. ποΈ It's formed by the oldest lens fibers that have been compressed over time. Think of it like the core of a tree, with accumulated layers. The nucleus contributes to the lens's refractive power, helping focus light. With age, it tends to harden, leading to presbyopia (difficulty focusing on near objects). It's the structural heart of the lens.