The alternative to a multifocal lens would be a monofocal IOL. A patient who chooses a monofocal (conventional single vision) IOL must be aware that glasses for near vision will be necessary. To reduce dependence on glasses for near vision tasks, monovision correction with monofocal IOLs is also an option. Monovision correction is a technique that makes use of the fact we have 2 eyes. In this technique, one eye is set for distance vision while the other is set for near vision. After an adjustment period which usually lasts several weeks, the brain neuroadapts to this new optical arrangement, allowing the patient to see far and near seamlessly. This monovision arrangement is often used in patients who wear contact lenses full time and who are over the age of 45. Monovision may not be the best choice for all patients.