What are typical changes in the vision of the aging adult?

Visual senescence involves a progressive decline in lens elasticity and a reduction in pupillary diameter, known as senile miosis. The photoreceptor density within the retina decreases, while the vitreous humor may undergo liquefaction or develop opacities. These changes compromise dark adaptation and contrast sensitivity. Aging also results in the yellowing of the lens, affecting color perception. A. Presbycusis: This term refers to age-related sensorineural hearing loss, which is a common auditory change in older adults. It involves the degeneration of hair cells in the cochlea rather than changes in the eye. It is an irrelevant finding for a visual health assessment. B. Increased extraocular muscle function: Aging typically leads to a decrease in the strength and coordination of the extraocular muscles. This can result in limited upward gaze or convergence insufficiency. There is no physiological mechanism that increases muscle function during the natural aging process. C. Decreased night vision: Age-related miosis and the thickening of the lens reduce the amount of light reaching the retina. This significantly impairs the ability to see in low-light conditions and increases sensitivity to glare. Older adults often report difficulty driving at night due to these physiological changes. D. Increased near vision: Presbyopia is the age-related loss of near vision due to the lens becoming rigid and unable to change shape for accommodation. Older adults experience decreased near vision, often requiring corrective lenses for reading. Increased near vision is not an expected finding in the geriatric population.