Q5 of 36 Page 327

Write true or false for the following statements:

To correct astigmatism we use cylindrical lens.

True.

If a person is suffering from astigmatism than he cannot simultaneously see both horizontal and vertical view of the object with same clarity.


Cylindrical lens has different curvature in horizontal and vertical direction which can enable the person to see the object clearly as shown in the figure below.



More from this chapter

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3

Write true or false for the following statements:

Presbyopia is a type of far sightedness.

 4

Write true or false for the following statements:

Convex lens can be used to correct long-sightedness.

 6

Write true or false for the following statements:

Short-sightedness is caused due to elongation of the eyeball.

 7

Write true or false for the following statements:

Abnormalities in the normal vision of the eye are called defects of vision.