Reading glasses correct near vision. Most people start wearing reading glasses around the age of 40 to 45 years, the time when your eyes start to lose some of the ability to focus up close because of the hardening of the lens within the eye. This is called presbyopia, and is different than distance correction (for nearsightedness) or closer-distance correction (for farsightedness).
Presbyopia literally means "old vision." It is not a disease but a part of the normal process of aging. You can be farsighted, not being able to see things nearby, or nearsighted, not able to see far away, and still need a reading prescription with either type of problem. Some people with presbyopia may only need glasses for reading or close work, with only minor or no distance correction.