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3.4 compare the change in the refractive power of the lens from rest to maximum accommodation
compare the change in the refractive power of the lens from rest to maximum accommodation
- When the eye is accommodated it focuses on close objects.
- In the eye at rest (unaccommodated) the lens is flattened because it is subjected to tension by the suspensory ligaments. The focal length of the lens is long and so distant objects are in focus.
- When accommodation occurs the ring of ciliary muscles contract, the tension in the suspensory ligaments is reduced and the lens bulges due to its natural elasticity. The refractive power of the lensĀ increases therefore shortening the focal length.