Monovision is a solution for presbyopia that has commonly been used by contact lens wearers and, in recent years, it has become a solution also embraced by presbyopes undergoing laser vision correction. With monovision, the person’s correction is modified so that one eye, typically the dominant eye, is corrected for distance vision while the other eye is corrected for near vision.
Amazingly, for most people the brain’s visual processing system is able to alternate attention from distance to near and from near to distance essentially automatically. The brain’s visual system simply alternates which image to pay attention to and does not require any special effort on the part of the individual. Monovision can be a very successful solution for presbyopia for many people and is an important option available to people that dislike reading glasses.
Despite the success of monovision, it does have some disadvantages. The eye that is set for near vision is no longer able to see well at distance. As a result, some patients may notice some distance vision loss in very dim light conditions. This can be easily remedied by prescription glasses for tasks such as driving or watching a movie. Although the latter might be inconvenient, patients find this much better than the incessant need to search for reading glasses just to read an email or check a text message.