On and Off-axis Optical Performance of Diffractive and Zonal Refractive Intraocular Lenses

Abstract

 

Purpose:

 

To compare the magnitude of stray light effects caused by various multifocal intraocular lenses.

 

Methods:

 

An artificial eye has been fabricated that has the average spherical and chromatic aberration found in the human eye. This model eye contains a saline-filled wet cell into which various IOLs can be mounted. We captured images of a negative USAF resolution target and 18 degree off-axis pinhole meant to simulate a car headlight. We explored the performance of the Alcon ReSTOR, Tecnis ZM900 and Acri.LISA diffractive multifocals, the AMO ReZoom zonal refractive multifocal and the Eyeonics Crystalens accommodating IOL. To simulate dark conditions, the study was done with maximum pupil allowed by the physical size of each IOLs.

 

Results:

 

For the off-axis pinhole image, the ZM900 and the ReZoom showed more flares around the image of the pinhole that were twice and 3 times, respectively, the size of stray light features found with the ReSTOR and ReSTOR aspheric IOLs. On-axis USAF target showed more stray light artifacts for the full-aperture diffractive and zonal refractive IOLs compared to the apodized refractive lens.

 

Conclusions:

 

Compared to other multifocal designs, aspheric apodized diffractive IOL reduces stray light artifacts for both on- and off-axis lighting under large pupil conditions.  

 

Keywords: intraocular lens • optical properties • presbyopia