Presbyopia describes the condition where the eye exhibits a progressively diminished ability to focus on near objects. It is a perfectly natural condition that eventually affects everyone but because the effects are gradual, you may not notice that anything is wrong with your eyesight initially.
However, as the condition progresses, you may find yourself struggling to read small print or books unless they are held at arm's length. With presbyopia, there are many factors (such as deterioration of lens elasticity) that affect the eyes ability to accommodate over varying distances; causing light (and therefore images) to be focused behind the retina. This leads to the eyesight becoming blurred. Presbyopia can be easily corrected with glasses or contact lenses with a combination of options such as, Multifocals, bi-focals, separate glasses or mono vision for contact lenses only.
Mono-vision is where we correct one eye for distance and the other for reading.