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Human Body & Health

If a 55-year-old person with early presbyopia strains to read fine print, which consequence is most likely?

A)Decreased retinal photoreceptor sensitivity
B)Increased depth of field perception
C)Reduced corneal refractive power
D)Greater vitreous humor turbidity

💡 Explanation

When someone with presbyopia strains to read, the eye attempts to increase the lens curvature via ciliary muscle contraction. However, the lens has lost elasticity, because the ciliary muscle is no longer as effective at changing the lens shape; therefore, increased depth of field perception results, rather than photoreceptor, corneal, or vitreous changes.

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