Define the power of accommodation of an eye and the range of the vision.
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Power of accommodation is the ability of the eye lens to focus near and far objects clearly on the retina by adjusting its focal length. Power of accommodation of the eye is limited. It implies the focal length of the eye lens cannot be reduced beyond certain minimum limit
The distance between the near point and far point of the eye is known as range of vision. A normal eye is capable of seeing objects clearly from a far point up to near point of 25 cm
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- it is the maximum variation in power of lens for focussing near or far object clearly on retina
- the range of vision of a human eye is 25cm
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