Question

How is it that the lens can focus images from a book that you are reading and then immediately also focus the image of children playing in your backyard?

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The lens is a strong, yet deformable, transparent structure bounded by a dense fibrous, elastic capsule. It lies between the anterior and posterior segments of the eye. Internally it is composed of precisely arranged layers of cells that have lost their organelles and are filled by a protein called crystallin. The lens focuses incoming light onto the retina, and its shape determines the degree of light refraction. The suspensory ligaments are attached to the lens capsule at its periphery and help the lens to change its shape. The tension in the suspensory ligaments varies according to the contraction and relaxation of the ciliary muscles in the ciliary body.

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