Monofocal Aspheric Lenses
There are several positive features of monofocal intraocular lenses (IOLs). First, the latest generation of monofocal IOLs, which employ aspheric lens technology, offer the sharpest image of any available IOL.
Due to their aspheric design, these lenses provide excellent contrast sensitivity and an extremely high quality of vision in a variety of lighting conditions. Individuals who require excellent distance vision, such as golfers, or those who frequently drive at night, may be well suited with an aspheric monocular IOL. People who have certain eye diseases, such as macular degeneration or glaucoma, may also benefit from an aspheric monocular IOL. For these individuals, the compromised state of the retina is assisted by the aspheric lens to form the sharpest image possible on the retina.
One disadvantage is that only one zone of clear vision can be chosen with a monofocal lens. Most people choose to have their monofocal lens set for distance vision and use reading glasses for near tasks. Alternatively, a monofocal lens can be set for near vision, but glasses or contact lenses are then required to see objects clearly at a distance. A blending of these two approaches is also available for individuals undergoing cataract surgery or natural lens replacement in both eyes. In this approach, called monovision, the monofocal IOL placed in one eye can be set for distance and the IOL placed in the other eye targeted for near. While 85% of people can adapt to monovision correction, a small percentage of people, however, may feel off-balance with this approach.