Our eyes just like other organs of the body develop changes with aging. While some changes are strictly ocular in origin, many are primarily caused by systemic diseases and conditions which affect the eyes also. The effects of aging in our eyes are basically because of changes in the hardness and transparency of the lens, degeneration of retina, hardening of blood vessels (arteriosclerosis) and degeneration of nerve fibers.
Here is a summary of the effects of aging on our eyes:
[First image by Nicolas Alejandro/ CC BY 2.0]