24. A person may suffer from both myopia and hypermetropia defects.
(a) What is this condition called ?
(b) When does it happen ? (c) Name the type of lens often required by the persons suffering from this defect. Draw labelled diagram of such lenses.
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The answers to the given questions are given below.
Explanation:
- a) This condition is called presbyopia.
- b) It happens when the ciliary muscles of the eye become weak so that it loses its control over the lens and the lens can not contract or relax the lens with required force.
- c) A person suffering from this defect is recommended to use the Bifocal lens to deal with the disease.
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