When the ciliary muscles are relaxed, the eye lens becomes thin, resulting in an increase in its focal length. This adaptation allows us to see distant objects clearly, as the lens focuses light from these objects onto the retina.
What happens to the focal length of the eye lens when the ciliary muscles are relaxed, and how does it affect vision?
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When the ciliary muscles are relaxed, the suspensory ligaments pull on the eye lens, causing it to become flatter. This increases the focal length of the lens. In this state, the eye is adapted for viewing distant objects. The relaxed ciliary muscles signify the eye is in a state of minimal accommodation. Distant light rays are focused directly on the retina without the need for additional refractive power. This adjustment, known as far vision or distance vision, allows the eye to see objects clearly at a distance, contributing to optimal visual acuity for objects beyond the point of accommodation.