The lens of the eye, known as the crystalline lens, is responsible for focusing light onto the retina. It changes shape, becoming thicker or thinner, to adjust focus for objects at varying distances, a process known as accommodation. By bending light rays, the lens helps create a clear image, allowing us to perceive details in our surroundings. Any disruption in this function, such as in conditions like cataracts, can impair vision and necessitate corrective measures like glasses or surgery.