Defects of Vision and Their Correction

Q.

Which of the following is not an eye defect?

1. Persistence

2. Myopia

3. Far sightedness

4. Presbyopia

Q. Cylindrical lenses are used in case of

1. Presbyopia
2. Astigmatism
3. Myopia
4. Hypermetropia

Q. Defects of eye

1. Presbyopia
2. Accomodation
3. Myopia
4. Astigmatism
5. Persistence
6. Hypermetropia
7. Cataract
8. Colour blindness

Q. A human eye is comprised of lens.

1. concave
2. convex
3. plain

Q. What are the properties of images formed on human retina?

1. Real
2. Virtual
3. Highly diminished
4. Highly enlarged
5. Inverted
6. Colourful
7. Erect
8. Focussed
9. Black and white

Q. Match the following eye defects with their remedial lenses.

1. Concave lenses
2. Cylindrical lens
3. Convex lenses
4. Bifocal lenses

Q. Question 14
Which of the following statement is correct?

(a) A person with myopia can see distant objects clearly
(b) A person with hypermetropia can see nearby objects clearly
(c) A person with myopia can see nearby objects clearly
(d) A person with hypermetropia cannot see distant objects clearly

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

Q. How does concave lens correct myopia?

1. Increases the curvature of the eye lens
2. Forms the image of the object at the retina
3. Decreases the elongation of the eyeball
4. All of the above

Q. Match the columns in the following table and explain them.

Column $1$	Column $2$	Column $3$
Farsightedness	Nearby object can be seen clearly	Bifocal lens
Presbyopia	Far away object can be seen clearly	Concave lens
Nearsightedness	Problem of old age	Concave lens