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| Power of Accommodation |
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| A normal eye can see both the distant and the nearby objects clearly. In the case of the eye, the image distance (v) is fixed as the distance between the eye lens and retina remains the same but the object distance (u) varies.
The eye focuses the images of all the objects, distant or nearby, at the
same place on the retina by changing the focal length of its lens. The eye lens changes its focal length by changing its thickness with the help of its ciliary muscles. |
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| The ability of the eye lens to change its focal length to focus the images of all the objects, distant or nearby on the retina is known as the power of accommodation. |
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| Whenever the eye is focused on a distant object, the ciliary muscles are relaxed and the ciliary muscles are tensed when the eye is
focused on a nearby object. |
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| The minimum distance up to which an eye can see clearly is called the least distance of distinct vision. The least distance of distinct vision is 25 cm for a normal eye and for infants it is 5 to 8 cm. |
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