The contraction of the ciliary muscles increases the curvature of the eye lens, causing it to become thicker. As a result, the focal length of the eye lens decreases. This adjustment enables us to see nearby objects clearly, as the lens focuses light from closer objects onto the retina.
How does the contraction of the ciliary muscles impact the curvature and focal length of the eye lens when looking at nearby objects?
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When the ciliary muscles contract during near vision or focusing on nearby objects, the tension on the suspensory ligaments reduces. This allows the eye lens to become more rounded and increases its refractive power. The increased curvature decreases the focal length of the lens, facilitating the convergence of light rays onto the retina. This process, called accommodation, ensures clear vision for close-up tasks. By dynamically adjusting the lens curvature and focal length, the contraction of the ciliary muscles enables the eye to adapt to varying distances, maintaining sharp and focused vision for objects at close proximity.