A 45-year-old patient reports increasing difficulty with reading small print and needing to hold their phone farther away to see it clearly. This condition is a normal age-related change. What is the anatomical cause of this condition, known as presbyopia?
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A
Elongation of the eyeball causing light to focus in front of the retina.
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B
Clouding of the crystalline lens, obstructing the passage of light.
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C
Damage to the optic nerve, typically associated with increased intraocular pressure.
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D
The crystalline lens becomes harder and less flexible, reducing its ability to change shape.