Sometimes when people reach the age of 40-45, they become presbyopic and begin to need glasses or bifocals for close vision. Most people will simply get reading glasses.
However, to be free from glasses, some people opt for Monovision. With Monovision, the eye that is used as the dominant eye is focused for distance vision, and the non-dominant eye is focused for near to intermediate vision. This can be done with contact lenses, refractive surgery or intraocular lenses. Since it is a compromise of the two eyes, most people’s vision isn’t perfectly crisp up close or far away.In addition, people who elect Monovision will go through an adjustment period as they learn to see with the eye best suited for the task.
Because Monovision isn't right for everyone, it is important to remember that if you participate in any activities that require crisp, sharp vision either up close or far away, monovision may not be right for you.