What part of the eye adjusts to focus on both near and far objects?

The lens of the eye plays a crucial role in focusing light onto the retina, allowing us to see clearly at various distances. It is a flexible structure that adjusts its shape to change the focal length. When you look at something far away, the lens flattens, making it easier to focus light from those distant objects. Conversely, when you look at something close up, the lens becomes more rounded, increasing its curvature to better focus the light from near objects. This process of changing shape is critical for accommodating vision and is known as accommodation.

Other structures in the eye have different functions. The lacrimal glands produce tears to keep the eye moist and free from debris. The pupil regulates the amount of light entering the eye but does not aid in focusing. The cornea helps to bend light entering the eye to a certain extent but does not change shape for focusing purposes. Therefore, the lens is the correct choice as it is the part of the eye specifically responsible for adjusting to focus on both near and far objects.