What is the function of the lens in the eye?

The lens in the eye plays a critical role in the process of vision, specifically by focusing light onto the retina. This is essential for clear vision, as the lens changes its shape, a process known as accommodation, allowing it to adjust the focus depending on the distance of the object being viewed. When light rays enter the eye, they pass through the cornea and then through the lens, which alters their path to ensure they converge on the retina, where images are formed. This precise focusing capability is vital for visual acuity.

In contrast, other functions mentioned in the options do not pertain to the lens. The role of protecting the eye from external particles is primarily handled by the eyelids and the tear film rather than the lens. Tear production is managed by the lacrimal glands, which are responsible for keeping the eye moist and free of debris. The color of the eye is determined by the iris, not the lens, which is transparent and does not contribute to the eye's coloration. Understanding the specific role of the lens is foundational for grasping how vision works and highlights its importance in the overall function of the eye.