Which eye changes cause most older people to have difficulty adjusting to near-sightedness (presbyopia) ?

A) Decreased dietary intake of calcium
B) Bilateral deposition of orbital fat
C) A loss of lens flexibility
D) An increase in pupil diameter

Presbyopia

Loss of elasticity of the lens and thus loss of ability to see close objects as a result of the aging process.

Lens Flexibility

The ability of the eye's lens to change shape to focus on objects at various distances, decreasing with age.

Near-Sightedness

A common vision condition, also known as myopia, where close objects are seen clearly, but distant ones are blurred due to the shape of the eye.