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In vivo chromatic aberration in patients bilaterally implanted with same design hydrophobic and hydrophilic IOLs

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Session Details

Session Title: Pseudophakic IOLs: Monofocal. Cataract Surgery Instrumentation

Session Date/Time: Saturday 05/09/2015 | 16:00-18:30

Paper Time: 16:06

Venue: Room 10

First Author: : S.Marcos SPAIN

Co Author(s): :    M. Vinas   C. Dorronsoro   N. Garzon   F. Poyales           

Abstract Details

Purpose:

Retinal image quality is affected both by monochromatic and chromatic aberrations of the ocular optics and their interactions. Intraocular lenses (IOLs) implanted in pseudophakic eyes influence both monochromatic and chromatic aberrrations, although typically only the monochromatic aberrations are measured. In this study we measured the ocular Longitudinal Chromatic Aberrations (LCA) in patients bilaterally implanted with monofocal IOLs by PhysIOL of similar aspheric design but different materials in a wide spectral range, using psychophysical and wavefront sensing methods.

Setting:

Visual Optics & Biophotonics Lab, Institute of Optics, Madrid, Spain

Methods:

LCA was obtained from psychophysical and wavefront sensing measurements of best-focus at 8 different wavelengths on 18 eyes (9 subjects) bilaterally implanted with hydrophobic Podeye IOLs and hydrophobic Poday IOLs (by PhysIOL) in each eye. Measurements were performed using psychophysical (480-700 nm) and wavefront sensing (480-950 nm) methods in a custom-developed Adaptive Optics system. Chromatic difference of focus curves were obtained by measuring best-focus at each wavelength. Psychophysical best-focus was manually searched by the subject while viewing a target. Objective best focus was obtained from the defocus Zernike terms. LCA was obtained from the polynomial fitting of those curves.

Results:

The LCA from psychophysical measurements (400-700 nm) was 1.42±0.10 D (Podeye) and 1.25±0.08 D (Poday). The LCA from wavefront sensing was 0.87±0.05 D and 0.77±0.05 D, respectively (400-700 nm) and 1.21±0.06 D and 1.05±0.06 D (480-950 nm). LCA was consistently higher in eyes implanted with hydrophobic than hydrophilic IOLs (difference of 0.17 and 0.15 D from either method; 400-700nm). As in young phakic eyes, LCA from the psychophysical method is consistently higher than from wavefront sensing, by 0.55 D (38.70%) for the Podeye and 0.47 D (37.97%) for the Poday.

Conclusions:

Our study provides estimates of the LCA measured in a wider spectral range in the visible and near infrared than that of previous studies, using both psychophysical and wavefront sensing measurements. We show small but significant differences in the LCA with hydrophobic and hydrophilic IOL, the LCA being consistently smaller with hydrophilic IOLs. The LCA from psychophysical measurements is consistently higher than from wavefront sensing. This study indicates that, for all types of measurements, pseudophakic eyes implanted with both, Podeye and Poday, IOLS show similar LCA than young eyes with natural crystalline lenses.

Financial Interest:

One of the authors research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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