Presbyopia is primarily associated with which age-related change?

Presbyopia is an age-related condition that manifests as difficulty focusing on close objects. This occurs primarily due to changes in the elasticity of the lens in the eye. As individuals age, the lens becomes stiffer and less capable of changing shape, which impairs the ability to properly focus on nearby text or objects. This is why many older adults find themselves needing reading glasses.

The other options do not accurately describe presbyopia. Loss of color perception is more commonly associated with conditions like cataracts or other retinal problems, and complete blindness does not occur as a direct result of aging alone—it involves more severe eye conditions or diseases. Similarly, increased night vision is not a characteristic associated with aging; in fact, many older adults experience difficulty seeing in low light, making this option incorrect as well. Thus, the correct statement regarding presbyopia is that it primarily results in difficulty focusing on close objects.