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from class: College Physics I – Introduction Definition Presbyopia is the age-related loss of the eye's ability to focus on nearby objects due to decreased elasticity of the lens. It typically becomes noticeable in middle age.
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Predict what's on your test 5 Must Know Facts For Your Next Test Presbyopia occurs because the lens loses its flexibility, making it difficult to change shape to focus on close-up objects. It is a natural part of aging and usually starts around age 40. The condition cannot be prevented, but it can be corrected with reading glasses, bifocals, or contact lenses. Presbyopia affects the refractive power of the eye, which is crucial for focusing light onto the retina for clear vision. Unlike other refractive errors like myopia or hyperopia, presbyopia is not caused by changes in the length of the eyeball. Review Questions What causes presbyopia and at what age does it typically start? How does presbyopia affect the refractive power of the eye? What are common methods to correct presbyopia? "Presbyopia" also found in:
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