A form of farsightedness occurring after middle age: Jane's mother was older than 45 and had presbyopia which was caused by a diminished elasticity of the crystalline lens in her eyes.

The reasons for this loss of the power of accommodation are not yet fully known. It is conventionally said to be a result of the lenses of the eyes becoming less elastic with time.

Presbyopia is associated with aging, however it happens with everyone. The first sign is often the necessity to hold reading material farther away in order to be able to focus on the contents.

The term presbyopia is said to come from the Greek for "elderly vision".