The lens of the eye that changes shape to focus light is called what?

The lens of the eye that changes shape to focus light is called the crystalline lens. This part of the eye plays a crucial role in the process of accommodation, which is the ability to adjust focus for near and distant objects. The crystalline lens is flexible and can change its curvature thanks to the ciliary muscles surrounding it. When these muscles contract or relax, they alter the shape of the lens, allowing it to focus light rays onto the retina for clear vision.

The cornea, while important for focusing light, does not change shape as the crystalline lens does. The aqueous humor is the fluid that fills the space between the lens and the cornea but does not participate in the refractive process. The retina is the layer at the back of the eye that receives the focused light but does not play a role in changing shape to adjust focus. Therefore, the crystalline lens is the correct answer, as it is specifically responsible for the dynamic focusing of light in the eye.