Question

Define power of accommodation what is the far point and near point of human eye with normal vision

Answer 1

the process of ciliary muscle to change the focal length of an eye lens to focus distant or near object clearly on retina is called accommodation of eye.

far point in human with normal vision is infinity.

near point in human eye with normal vision is 25 CM.

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Answer 2

[1] The focal length of the eye lens can be adjusted automatically by ciliary muscles (either by relaxation or contraction) so that the image is always formed on the retina irrespective of the object distance, i.e., whether the object is distant or nearer. Such an ability of the eye lens to adjust its focal length is called the power of accomodation.

[2] The maximum distance upto which the eye is able to see objects clearly without strain is called the far point of the eye. For normal eye, it is infinity.

[3] The minimum distance upto which the eye is able to see objects clearly without strain is called the near point of the eye. For normal eye, it is 25 cm.

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One more thing to know is that, the distance between the near point and the far point of the eye is called the range of vision. It ranges from 25 cm to infinity for normal eye.

For defect of vision, proper remedies are there, such that the image, should get focussed always on retina.

$\bold{QUESTIONS\:FOR\:YOU\: :}$

1) As we know lens are generally made up of glass. Is the lens of our eye made of glass? Give reasons for your answer.

2) Where the image of an object infront of eye (bearing a suitable distance) should always be focussed (formed)?

3) Is there any limit present to the power of accomodation?