Defects of vision

Question 1

What is myopia?

Answer 1

The defect of vision due to which a person cannot see the distant object clearly.

Question 2

What is the far point of myopia?

Answer 2

Not infinity

Question 3

list out the causes of myopia.

Answer 3

1. due to high converging power of eye-lens
2. due to eyeball being too long or elongated

Question 4

How can myopia be corrected?

Answer 4

By wearing a spectacles containing concave lens which can reduce the amount of converging power of eye lens

Question 5

What is Hypermetropia?

Answer 5

The defect of vision due to which a person cannot see nearby objects clearly

Question 6

list out the causes of Hypermetropia.

Answer 6

1. due to low converging power of eye-lens
   2.due to eye ball being too short

Question 7

How can hypermetropia be corrected?

Answer 7

By wearing a spectacles containing convex lens which can increase the amount of converging power eye lens

Question 8

What is the near point of Hypermetropia?

Answer 8

more than that of 25cm

Question 9

What do you mean by Prebyopia?

Answer 9

The defect of vision due to which old people cannot see the nearby objects clearly due to loss of power of accommodation

Question 10

What do you mean by Astigmatism?

Answer 10

Its a refraction error in which a person cannot see both horizontal and vertical views of an object with the same clarity.

Question 11

What is night blindness

Answer 11

It means a person experiences poor vision when there is low light or in the night time conditions.

Question 12

list the causes of night blindness

Answer 12

1. due to the deficiency of vitamins, cataract, nearsightedness, genetic, etc…