Q. The ability of an eye to adjust its focal length by itself to see nearby and distant objects is called as ______________.
- Power of accommodation
- Power of lens
- Power of astigmatism
- 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?
The lens of a myopic person is __________ in the middle.
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?
- +1.50 D
- -1.25 D
- +1 D
- -1.75 D
What is the reason for the occurence of hypermetropic defect?
Elongation of the eye ball
Excessive curvature of eye lens
Shortening of eye ball
Both a and b
Q. In case of myopia, the image is formed beyond retina.
Q. People who do not have the ability to see far-off objects have hypermetropia.
Q. Concave lens is used in case of _______.
Q. A person suffering from which defect will have a shorter far point than normal?
Q. A person needs a lens of power −2.5 D for correcting his vision. What is the defect of vision that the person is suffering from? Also, find the focal length of the lens.
- Hypermetropia, 0.4 m
- Myopia, 0.4 m
- Myopia, −0.4 m
- Hypermetropia, −0.4 m