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How can change of size of eyeball be one...

How can change of size of eyeball be one of the reason for (i) myopia and (ii) herpmetropia eye ? Compare the size eyeball with that of a normal eye in each case.
How does this change of size affect the position of image in each case ?

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(i) In an eye suffering from myopia, the eyeball is elongated compared to that of a normal eye. Due to this, the image is formed in front of the retina instead of on the retina.
(ii) In an eye suffering from hypermetropia, the eyeball is too small in length compared to that of a normal eye. Due to this the image is formed behind the retina instead of on the retina.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - SHORT ANSWER TYPE QUESTIONS - I
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  2. Name the screen on which an image is formed in the eye. What is the ra...

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  3. How can change of size of eyeball be one of the reason for (i) myopia ...

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  4. Explain giving reason the type of lens used to correct the defect of v...

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  5. Name the part of eye where the image is formed in a nornaml human eye....

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  6. What is hypermetropia or far-sightedness ? Name the type of lens used ...

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  7. What is presbyopia ? Write two causes of this defect.

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  8. What are bifocal lenses ? Who needs to use them ?

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