In vivo measurement of longitudinal chromatic aberration in patients implanted with the FineVision Trifocal IOL

Session Details

Session Title: Pseudophakic IOLs: Multifocal I

Session Date/Time: Sunday 08/10/2017 | 08:00-10:00

Paper Time: 09:08

Venue: Room 2.1

First Author: : S.Marcos SPAIN

Co Author(s): :    M. Vinas   A. Gonzalez-Ramos   C. Dorronsoro   V. Akondi   N. Garzon   F. Poyales     

Abstract Details

Purpose:

The eye’s optical quality is affected by both monochromatic and polychromatic aberrations. In patients implanted with multifocal diffractive IOLs the longitudinal chromatic aberration is dependent upon the dispersion properties of the ocular elements and those of the IOL material as well as the diffractive design. We used a custom polychromatic Adaptive Optis (AO) system to measure the LCA -subjective and objective double-pass (DP) retinal imaging- in patients bilaterally implanted with hydrophilic trifocal diffractive IOLs (FineVision, PhysIOL, Belgium)

Setting:

Visual Optics & Biophotonics Lab, Institute of Optics, Madrid, Spain; Innova Ocular IOA, Madrid, Spain

Methods:

Ten patients (66.42±3.8yrs;0.18±0.14D) bilaterally implanted with FineVision participated in the study. AO provided with a supercontinuum laser, deformable mirror, motorized Badal optometer, pupil monitoring channel, DP retinal imaging channel, and psychophysical channel with monochromatically stimuli was used in measurements at 3 different viewing distances (0D/+1.75D/+3.50D), with 4-mm pupils. Patients set their subjective best-focus of stimuli at 5 wavelengths (480-700nm). Best-focused images from through-focus (0.25D steps) DP image series were obtained at 3 wavelengths. LCA was computed from fitted chromatic difference of focus curves (objective and subjective) as the difference between 480 and 700nm for near, intermediate and far.

Results:

The average subjective-LCA was 0.64±0.04D for far, 0.23±0.05D for intermediate and 0.17±0.05D for near. The average objective-LCA was 0.56±0.21D for far, 0.24±0.19D for intermediate and 0.15±0.18D for near.

Conclusions:

Objective-LCA is lower than subjective-LCA in agreement with previous studies on phakic, and monofocal IOL implanted patients, consistent with a λ dependence of the reflecting retinal layers. LCA at far is driven by refraction, while the diffractive design lowers LCA at intermediate and at near. In vivo measurements of LCA allow understanding the relative contribution of refractive and diffractive LCA and eventually optimize IOL designs to improve polychromatic image quality.

Financial Disclosure:

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