What makes the lens in your eye change shape?

The lens in the eye changes shape due to the action of the ciliary muscles, which are located around the lens. These muscles are responsible for controlling the curvature of the lens, allowing the eye to focus on objects at different distances.

When the ciliary muscles contract, they cause the lens to become more rounded or convex, which increases its focusing power. This allows the eye to focus on nearby objects. Conversely, when the ciliary muscles relax, the lens flattens out, reducing its focusing power and enabling the eye to focus on distant objects.

This dynamic adjustment of the lens's shape is known as accommodation, and it is a crucial function that enables the eye to maintain clear vision at various distances. It is an involuntary reflex controlled by the brain, allowing us to shift focus seamlessly between objects without consciously exerting effort.