differenciate presbyopia and hypermetropia
Asked by
| 1st Jan, 2013,
10:54: AM
Expert Answer:
HYPERMETROPIA:
- it the defect of a human eye, which is able to see far away object clearly but not the nearby objects.
- the correction lens for this defect is convex lens of suitable focal length or power.
- causes:
1: decrease in length of thr eye ball.
2: increase in focal length of the eye lens.
PRESBYOPIA:
- it is th edefect of eye during old age, with increase of age the ciliary muscles holding the eye lens weaken and the eye loses some of its flexibility this causes presbyopia.
- the correction for this lens is a bifocal lens.
- causes:
1: increase in focal length of eye lens.
2: old age.
HYPERMETROPIA:
- it the defect of a human eye, which is able to see far away object clearly but not the nearby objects.
- the correction lens for this defect is convex lens of suitable focal length or power.
- causes:
1: decrease in length of thr eye ball.
2: increase in focal length of the eye lens.
PRESBYOPIA:
- it is th edefect of eye during old age, with increase of age the ciliary muscles holding the eye lens weaken and the eye loses some of its flexibility this causes presbyopia.
- the correction for this lens is a bifocal lens.
- causes:
1: increase in focal length of eye lens.
2: old age.
Answered by
| 1st Jan, 2013,
12:09: PM
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