Correction of Eye Defects

Q. The far point of a myopic person is 100 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

1. Convex lens, Power = 1.5 D
2. Concave lens, Power = -1.5 D
3. Convex lens, Power = 1 D
4. Concave lens, Power = -1 D

Q.

Which of the following is not an eye defect?

1. Myopia

2. Far sightedness

3. Persistence

4. Presbyopia

Q.

When you are looking at the objects closer to the eye, the focal length of eye lens:

1. Remains same

2. Increases

3. Decreases

4. Fluctuates

Q. The ability of eye lens to adjust its focal length is called

1. accommodation
2. presbyopia
3. myopia
4. hypermetropia

Q. A person cannot see the lines drawn parallel to each other clearly. He is suffering from _________.

1. presbyopia
2. astigmatism
3. myopia
4. hypermetropia

Q.

The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

1. - 3 D

2. +3 D

3. +4 D

4. -4 D

Q. Cylindrical lenses are used in case of

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

Q.

Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

1. Convex and Concave

2. Concave and Convex

3. Both are concave

4. Both are convex

Q.

When you keep objects very close to the eye the ciliary muscles ________.

1. expand

2. contract

3. reflects all the light

4. remain same