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What is the cause for presbyopia ?...

What is the cause for presbyopia ?

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The eye lens becomes less elastic or non-elastic after 40 years as the, accommodation power of eye becomes less.
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KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in very short as directed (Miscellaneous) )
  1. What would have been the colour of the sky, had there been no atmosphe...

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  2. Due to which phenomenon is the colour of water in deep sea blue ?

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  3. What is the cause for presbyopia ?

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  4. Give the relationship between wavelength of light and its angle of dev...

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  5. For which colour has the glass larger refractive index – violet or gre...

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  6. Which part of human eye is also known as 'white of the eye' ?

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  7. Why is blind spot so called ?

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  8. Which liquid is filled in the space between the eye lens and the retin...

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  9. What happens to the pupil of the eye when the light is (a) very bright...

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  10. A man is wearing spectacles of focal length +1 m. What can be the defe...

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  11. Which portion of a bi-focal lens is (a) a concave lens (b)a convex l...

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  12. When sunlight enters into a room filled with dark smoke, its path beco...

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  13. What is the function of the iris ?

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  14. What are light sensitive cells ?

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  15. What type of signals are generated and sent to the brain by light sens...

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  16. What holds the crystalline lens in the human eye?

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  17. Which part of the human eye helps in changing the thickness of the eye...

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  18. What is dispersion of white light ?

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  19. Give the main difference between the lens of the human eye and the len...

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  20. The image formed on the retina is inverted, but we see the object erec...

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