Presbyopia: In old age, after the age of 40 or more noticably after the age of 45, the ciliary muscles become weak and are not able to contract enough to decrease the focal length adequately. In this case also, objects at the normal near point are not focused on the retina.When far-sightedness occurs due to this reason, it is called presbyopia.
A person may have any of the above defects or a combination of these defects. Among the elderly, the combination of near-sightedness and far-sightedness is common. Such people need converging glasses (convex lens) for reading and diverging glasses (concave lens) for seeing at a distance. They either keep two sets of spectacles or use bifocal lenses whose upper portion is for distant vision and lower portion is for reading. In many cases, both parts of the bifocal lens are concave. The upper part is highly divergent to correct near-sightedness and the lower part is kept less divergent to aid reading.These days, it is also possible to correct the refractive defects using surgical interventions.
In a bifocal lens the upper part is _________ and the lower part is for _________________ | |||
Right Option : B | |||
View Explanation |
Mostly the old people's near point recedes and far point advances. This problem is referred to as _____________________. | |||
Right Option : C | |||
View Explanation |
In a bifocal lens the upper part is for ______________. | |||
Right Option : C | |||
View Explanation |
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