What role does the lens play in vision?

The lens plays a crucial role in vision by focusing light rays onto the retina. It achieves this through its ability to change shape, a process known as accommodation, which allows the eye to focus on objects at various distances. When light enters the eye, it first passes through the cornea and then through the lens, which bends the light rays appropriately so that they converge on the retina, the light-sensitive layer at the back of the eye. This precise focusing is essential for clear vision; without it, images can appear blurry or distorted. The lens's transparency and its ability to adjust its curvature are vital in ensuring that the light is accurately directed towards the photoreceptors in the retina, enabling the brain to interpret visual information.