The most common type of intraocular lens has a monofocal optic with a single corrective power (focal point). Monofocal lenses are designed to provide clear vision for one distance, usually far, which is important for tasks such as driving. However, patients with monofocal IOLs may continue to need eyeglasses for activities at other distances, for example, reading.

Similar to bifocal eyeglasses, bifocal intraocular lenses have two focal points to provide clear vision for both distance and up close. Patients treated with bifocal IOLs may need to wear eyeglasses for certain intermediaterange tasks (approx. 80 cm) such as computer work.

The most advanced intraocular lenses today, trifocal IOLs, have been used to successfully treat cataracts for several years. These lenses are designed to project multiple images onto the retina, which the brain combines into one sharp picture, allowing patients to see objects clearly at various distances – similar to progressive eyeglass lenses. Trifocal intraocular lenses are designed to enable not only clear far vision and a comfortable reading distance. This type of IOL provides in addition good intermediate vision, which is essential for performing daily activities such as cooking or computer work. As a result, many patients with trifocal lenses no longer need to wear glasses.