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Name one of the common defects of vision...

Name one of the common defects of vision and the type of lens used to remove it.

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Defect Of Vision And Their Correction

Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens, a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.

LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. An object is moved closer to an eye. What changes must take place in t...

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  2. Why does the eye-lens not have to do all the work of converging incomi...

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  3. Name one of the common defects of vision and the type of lens used to ...

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  4. Name the defect of vision in a person : (a) whose near point is more...

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  5. Which defect of vision can be rectified : (a) by using a concave len...

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  6. What type of lens is used to correct (a) hypermetropia (b) myopia ?

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  7. What is the other name of (a) myopia (b) hypermetropia ?

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  8. What is the scientific name of (a) short-sightedness, and (b) long-sig...

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  9. What kind of lens is used to correct (a) short-sightedness (b) long-s...

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  10. State whether the following statement is true or false : Short-sight...

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  11. Name the defect of vision in which the eye-lens loses its power of acc...

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  12. Name the defect of vision which makes the eye-lens cloudly resulting i...

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  13. What is the other name of old age hypermetropia ?

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  14. Name any two defects of vision which can be corrected by using spectac...

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  15. Name one defect of vision (or eye) which cannot be corrected by any ty...

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  16. What is the far point of a person suffering from hypermetropia (or sho...

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  17. Where is the near point of a person suffering from hypermetropia (or l...

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  18. A man can read the number of a distant bus clearly but he finds diffic...

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  19. A student sitting in the last row of the class-room is not able to rea...

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  20. Complete the following sentences : (a) A short-sighted person cannot...

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