Which defect of vision occurs due to the weakening of ciliary muscles with age?
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A.
Astigmatism
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B.
Myopia
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C.
Hypermetropia
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D.
Presbyopia
Correct Answer:
D. Presbyopia
Explanation:
The correct answer is Presbyopia. This vision defect typically develops with age, often starting around age 40, as the ciliary muscles weaken and the eye's crystalline lens loses its natural elasticity. These muscles are responsible for adjusting the lens shape to focus on nearby objects; as they lose strength and flexibility, the eye's power of accommodation decreases, making it difficult to see close-up items clearly. This condition is a natural part of the aging process and is distinct from other refractive errors like myopia or astigmatism, which are not caused by age-related muscle weakening.
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