Myopia

Q. The ability of an eye to adjust its focal length by itself to see nearby and distant objects is called as ______________.

1. Power of accommodation
2. Power of lens
3. Power of astigmatism
4. Power of an eye

Q. A student has difficulty reading the black board while sitting in the last row. Which defect of vision does he has?

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

Q.

The lens of a myopic person is __________ in the middle.

1. thin

2. thick

3. normal

4. cylindrical

Q. The far point of a myopic person is 80 cm. What is the power of the lens required to enable him to see the distant objects clearly?

1. +1.50 D
2. -1.25 D
3. +1 D
4. -1.75 D

Q.

What is the reason for the occurence of hypermetropic defect?

1. Elongation of the eye ball

2. Excessive curvature of eye lens

3. Shortening of eye ball

4. Both a and b

Q. In case of myopia, the image is formed beyond retina.

1. True
2. False

Q. People who do not have the ability to see far-off objects have hypermetropia.

1. False
2. True

Q. Concave lens is used in case of _______.

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

Q. A person suffering from which defect will have a shorter far point than normal?

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

Q. A person needs a lens of power $-2.5D$ for correcting his vision. What is the defect of vision that the person is suffering from? Also, find the focal length of the lens.

1. Hypermetropia, $0.4m$
2. Myopia, $0.4m$
3. Myopia, $-0.4m$
4. Hypermetropia, $-0.4m$