AcrySof IQ ReSTOR IOL

 (Alcon)

Tecnis Multifocal

 (AMO-Abbott Medical Optics)

Crystalens AO

(Bausch&Lomb)

ReZoom

(AMO)

Material

Hydrophobic Acrylic

Acrylic

Biosil, a biocompatible third-generation silicone.

Acrylic

Design*

See chart below

Diffractive/Aspheric Multifocal based on the optical principal of apodization*

Diffractive/Aspheric Multifocal -  Aspheric front surface and a diffractive  posterior surface for near and distance images

Accommodating lens* with new aspheric design specific to AO version

Zonal Refractive Multifocal

Enchancements

UV blocker* with chromophores*

-UV blocker
-Chromatic aberration correction*

No UV blocker

UV blocker

Designs

Advantages

Disadvantages

Examples

Zonal Refractive Multifocal

Creates several simultaneous images, allows for viewing objects at all distances

Undesirable visual aberrations - including night glare, halos, and starburst

ReZoom

Diffractive/ Aspheric Multifocal

-They compensate for spherical abberation and improve visual quality in most patients

-Generate two distinct images, one for distance and one for near

Reduced intermediate vision

AcrySof ReStor, Tecnic Multifocal

Accommodating IOLs

-Simulates the natural accommodation process by allowing the IOL to move based on ocular muscle contraction, much like the natural lens did before cataract formation and removal

-Typically provide better distance vision compared to multifocals. 

Reduced near vision that often requires the use of reading glasses to improve reading at near.

Crystalens HD, Crystalens AO

Apodized

A series of graduated steps that result in diffraction of light at both distance and near

Accommodation

The ability of the eye's natural lens to change shape to focus on objects at  various distances

Accommodating lens

As with the natural lens, an accommodating lens moves and flexes, in response to ciliary muscle contractions in the eye. These contractions drive forward movements of the lens so the eye can maintain a clear image as it focuses on near, intermediate and far objects. (Bausch + Lomb)

Cataract

A "clouding" of the lens in your eye. As light passes through the cataractous lens, it is diffused or scattered, resulting in blurred or defocused vision.

Chromophores

Material added to IOLs to increase absorption of even more of the potentially harmful visible light in the violet and blue spectrum.

Halos

A circular flare or hazy ring that may appear around a headlight or other light source.

Intraocular lenses (IOLs)

Implantable devices that replace the natural lens in the human eye.

Spherical Abberations

An irregularity in the shape of the lens. As the eye ages, the lens gets thicker and rounder, causing image quality to deteriorate. Often associated with loss of contrast sensitivity and poor night vision.

UV blocker

Ultraviolet (UV) absorber to prevent excessive exposure of UV light to the retina