Laboratory assessment of the effect of spectral filters on the optical performance in an extended-depth-of-focus intraocular lens

Session Details

Session Title: Presented Poster Session: Enlarged Depth of Focus vs Multifocal IOLs

Venue: Poster Village: Pod 1

First Author: : G.Labuz GERMANY

Co Author(s): :    R. Khoramnia   G. Auffarth                    

Abstract Details

Purpose:

To evaluate how the image quality of a diffractive extended-depth-of-focus (EDoF) intraocular lens (IOL) depends on the light wavelength. 2) To measure longitudinal chromatic aberration and 3) to demonstrate how uncorrected chromatic effects worsen the IOLs’ optical performance in polychromatic light.

Setting:

David J. Apple International Laboratory for Ocular Pathology, Department of Ophthalmology, University of Heidelberg, Germany.

Methods:

An IOL-metrology device was used to assess the image quality of a +21D Tecnis Symfony (J&J Vision) in monochromatic light of three different wavelengths: blue- (480nm), green- (546nm) and red-light (644nm), and in polychromatic light with spectral weighting. The modulation transfer function (MTF) and the average MTF were obtained using a 3-mm aperture at best primary and secondary (intermediate) focus. Chromatic aberration was derived from blue- and red-light optical power measurements.

Results:

The MTF analysis confirmed the wavelength dependence of the Symfony. In blue light, the average MTF was 2-fold larger at secondary- than at primary-focus. It was reversed in red light, as the MTF was 2.5-fold larger at far than at intermediate. The far/intermediate image quality was more comparable in the green and polychromatic light. The Symfony partly corrected chromatic dispersion of the model eye, which was lower by 0.17D. Uncorrected chromatic aberration at far-focus was 0.87D, which resulted in a 20%-MTF loss in polychromatic light. At the secondary focus, 0.24D of chromatic aberration had minimal effects on the image quality.

Conclusions:

We demonstrated that Symfony's image quality indeed depends on light wavelength; as the lens proved intermediate-dominant in blue-light and far-dominant in red-light. We have yet to elucidate how this spectral dependency affects visual performance. Although Symfony has the potential to lower chromatic dispersion of the pseudophakic eye, we found in vitro that the correction appears to be more effective at the secondary than at the primary focus.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a competing company