lasik-logo Crystalens IOL Lens Implants by Bausch & Lomb

Accommodating IOL

Crystalens AO® Accommodating Posterior Chamber Intraocular Lens

Crystalens® is the first and only FDA approved accommodating IOL.  Like multifocal IOLs, it is also used for visual correction after the removal of a cataract lens.  It is an IOL that accommodates like the eye's natural lens, allowing for focusing at distance, intermediate and near.  Accommodation is the ability to change focus throughout the range of vision much like a zoom lens. 

Crystalens AO by Bausch & Lomb Premium IOLThe Crystalens AO® by Bausch & Lomb (Rochester, NY) brings together traditional Crystalens accommodating lens technology with an aspheric lens design to help reduce aberrations.  Aberrations affect vision quality and when reduced it can enhance contrast sensitivity. This accommodating aspheric IOL attempts to deliver premium vision at all distances without any vision compromise. 

Another advantage is that optical performance is unaffected by pupil size or location of the optic due to uniform center-to-edge power, helping to have more consistent vision in various environments.

How Crystalens AO Works                                                       

The Crystalens® is attached to the ciliary muscle, a circular muscle that surrounds the lens in the eye. When the ciliary muscle contracts it bulges backwards and increases pressure behind the lens, thus forcing the optic forward. Relaxation of the muscle increases the pressure in front of the lens to move the optic backwards, thus enabling the lens to focus naturally at all distances.

Crystalens accommodating IOL lens implant for the eye 

Disadvantages of Crystalens AO

Crystalens continues to improve with each new generation of lens.  The Crystalens AO is another great improvement and a very good product.  However, nothing is perfect.  A disadvantage of the Crystalens® involves the possibility that the IOL won't accommodate as advertised, resulting in a need for glasses to read or to use a computer (just like what you'd get with monofocals).  Some recipients have had problems with glare and halos.  It also lacks adequate UV protection that is found in other IOLs.  This leaves the eye unprotected from the harmful rays of the sun.  Additionally, it requires a well experienced surgeon and may take up to one year to fully adapt. 

Furthermore, since the Crystalens is again considered "premium", additional surgery costs have to be considered. 





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


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)


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.


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


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



AcrySof IQ ReSTOR IOL (Alcon)

Tecnis Multifocal (AMO)

Crystalens AO (B&L)

ReZoom (AMO)


Hydrophobic Acrylic


Biosil, a biocompatible third-generation silicone.



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


UV blocker* with chromophores*

-UV blocker
-Chromatic aberration correction*

No UV blocker

UV blocker