What is presbyopia write two causes of this defect name the type of lens which can be used in this?
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generally , the focusing power of the eye lens decreases with age . the muscles near the lens lose their ability to change the focal length of lens. the near point of the lens shifts farther from the eye . because of this old people cannot see nearby objects clearly . this defect is known as presbyopia.
in such a case bifocal lenses are required to correct the defect.
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in such a case bifocal lenses are required to correct the defect.
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Presbyopia is an eye defect, where a person can't clearly see closer objects.
Explanation:
Presbyopia is an eye defect, where a person can't clearly see closer objects. This deficiency occurs due to the lack of eye lodging capacity. Presbyopia commonly occurs in the elderly.
The following are the two reasons for this defect.
1. Ciliary muscles weakening in old age.
2. Reduction of eye-lens sensitivity or Reduction of eye-lens flexibility.
Presbyopia, that is a special case of hypermetropia, may be rectified with convex lens spectacles.
To know more about presbyopia, visit:
Define presbyopia and it's causes
https://brainly.in/question/4858836
What is the Myopia,Hypermetropia and Presbyopia ?
https://brainly.in/question/3056466
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