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How is cataract caused ? How is it cured...

How is cataract caused ? How is it cured ?

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At old age, the eye lens of some people becomes milky and cloudy causing blurred vision. This is called cataract and can be corrected by cataract surgery.
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(i) Write the name given to bases that are highly soluble in water. Give an example. (ii) How is tooth decay related to pH? How can it be prevented? (iii) Why does bee-sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How?

ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - VERY SHORT ANSWER TYPE QUESTIONS
  1. why does it take some time to see objects in a cinema hall when we jus...

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  2. Define the least distance of distinct vision. What is its value ?

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  3. How is cataract caused ? How is it cured ?

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  4. Mention one advantage of having two eyes instead of one.

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  5. How do the eyes of a tiger difer from that of a rabbit ?

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  6. What is the main advantage of having two eyes in front of the head ?

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  7. A person can see nearby objects clearly but distant objects appear blu...

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  8. In which defect of vision is (i) the far point nearer than infinity ? ...

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  9. A person can see distant objects clearly but nearby objects appear blu...

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  10. Which vision defect arises when the eyeball (i) shrinks and (ii) elong...

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  11. Which eye defect can be corrected using (i) convex lens and (ii) conca...

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  12. Where is the image formed if a person is suffering from (i) myopia and...

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  13. An aged person is having difficulty in seeing nearby objects clearly. ...

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  14. Bifocal lenses are used to correct which defect of vision ?

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  15. Observe the given figure. Name the eye defect indicated in the figure ...

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  16. Mohan is suffering from diabetes and hypertension. Can be pledge to do...

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  17. Shilpa is using spectacles. Is she eligible to pledge to donate her ey...

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  18. What is dispersion of light?

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  19. Name the colours that constitute white light in the order of increasin...

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  20. List the colours observed in a spectrum through a prism in the increas...

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