Question

difference between near point and far point of the eye

Answer 1

That is, the focal length of the lens is negative. The near point of the eye is the point nearest the eye at which an object can be placed and still have a sharp image produced on the retina. For a normal eye, the near point is located 25cm from the eye.

Answer 2

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In optics, the closest point at which an object can be brought into focus by the eye is called the eye's near point. A standard near point distance of 25 cm is typically assumed in the design of optical instruments, and in characterizing optical devices such as magnifying glasses.


Myopia

 In myopia , a person is not able to see distant objects clearly.

Hypermetropia

 In hypermetropia , a person is not able to clearly see the nearby objects.

Myopia 

In this defect , lens are not able to produce sharp image of the distant objects on the retina instead the image is formed in front of the retina .

Hypermetropia 

In this defect , image is formed behind the retina.

Myopia

 The reduction in the focal length of the eye lens may be a possible cause.

Hypermetropia 

The increase in focal length of the eye lens may be a cause.

Myopia

Another cause can be the elongation of eye ball.

Hypermetropia 

It may also be caused due to flattening of the eyeball .

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