Which condition results from age-related changes in the lens of the eye?

Cataracts are a direct result of age-related changes in the lens of the eye, characterized by the clouding of the lens, which can lead to decreased vision. As people age, the proteins in the lens can clump together, forming opacities that obstruct the passage of light. This condition can affect the clarity of vision and may require surgical intervention to restore sight.

Presbyopia, another condition associated with aging, specifically involves the lens losing its flexibility, making it difficult for the eye to focus on close objects. This reduction in accommodation is a normal part of the aging process and affects nearly everyone over the age of 40.

While glaucoma is primarily related to increased intraocular pressure and does not directly result from changes in the lens itself, it is often grouped with other ocular conditions that can arise with age.

The inclusion of all these conditions in the answer reflects the broader impact of age-related changes on eye health. Although each condition has distinct mechanisms and effects, they collectively illustrate the changes that occur in the aging eye, making "all of the above" a reasonable selection given the context.