Question

What happens to the focal length and power of the eye lens during :
a) Myopia
b) Hypermetropia
Please explain well

Answer 1

Answer:

Due to this eye can increase or decrease focal length of the lens in order to see either close or distant objects. In order to see nearby objects the ciliary muscles contract and lens become thick and focal length is decreased which helps to see nearby objects.

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Answer 2

Answer:

Nearsightedness, or myopia, is the inability to see distant objects clearly while close objects are clear. The eye over converges the nearly parallel rays from a distant object, and the rays cross in front of the retina. More divergent rays from a close object are converged on the retina for a clear image. The distance to the farthest object that can be seen clearly is called the far point of the eye (normally infinity).

Farsightedness, or hypermeteropia, is the inability to see close objects clearly while distant objects may be clear. A farsighted eye does not converge sufficient rays from a close object to make the rays meet on the retina.