Monovision is a technique of blending near vision in one eye and distance vision in the other. Monovision can be achieved as part of LASIK, Implantable Lens Refractive Surgery and Cataract surgery.

The easiest way to explain monovision is that it is an "overlapping" of near and distance vision. Where the two overlap is clear vision, with one eye responsible for near and the other eye responsible for distance vision. The chief advantage of monovision is the freedom it provides from reading glasses. After six to eight weeks the brain makes these changes automatically, without any conscious effort or awareness. Monovision makes it possible to repeatedly change the range of focus, without having to constantly remove or add corrective lenses.  Monovision is not for everyone. It can be hard for the monovision patient to adapt to this "imbalance" because it is a compromise to perfect vision. People with monovision may have some degree of decreased depth perception without corrective lenses. They may also notice blurred vision in the "near" eye when glancing in the side mirror of their cars or when the vision in the "distance" eye is blocked by an object or have trouble with headlight glare when driving at night. Some people with monovision elect to wear corrective lenses for detail activities, such as night driving or prolonged reading so that both eyes are then in simultaneous focus.