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← Human Body & HealthA 60-year-old experiences blurred near vision despite clear distance sight. What distinguishes this age-related presbyopia from simple myopia?
A)Lens thickness increases uniformly with age
B)Retinal cone density sharply declines centrally
C)Ciliary muscle loses contractility elasticity✓
D)Corneal curvature becomes increasingly irregular
💡 Explanation
Presbyopia arises from the age-related decline in the ciliary muscle's ability to contract and relax, reducing lens elasticity and accommodation. Because ciliary muscle function degrades, the lens cannot focus on near objects; therefore, presbyopia differs from myopia, which results from refractive errors rather than accommodation failure.
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