Posters
Subjective and objective analysis of pseudoaccomodation in aberration-free and negative spherical aberration IOLs using ray-tracing aberrometry
Poster Details
First Author: L.Gouvea USA
Co Author(s): J. Haddad G. Waring IV K. Rocha
Abstract Details
Purpose:
To evaluate subjective depth of focus curves and dynamic changes of lower and higher-order aberrations using ray-tracing aberrometry in aberration-free and negative spherical aberration intraocular lenses (IOL) in normal eyes and hyperprolate cornea.
Setting:
Storm Eye Institute, Medical University of South Carolina, South Carolina, United States.
Methods:
Ray-tracing aberrometry (i-Trace) was used to objectively measure depth of focus in normal and post hyperopic-LASIK eyes (hyperprolate corneas) implanted with an aspheric neutral IOL (EnVista, Bausch&Lomb), and in normal eyes implanted with an aspheric IOL with negative spherical aberration (ZCBOO, J&J) at 1–3 months postoperatively. Depth of focus curves, distance-corrected near visual acuity at 33cm (DCNVA), defocus, higher-order aberrations (HOAs), Visual Strehl of the Optical Transfer Function (VSOTF), effective range of focus (EROF), pseudoaccommodation as well as accommodation range index (sphere shift) were recorded.
Results:
45 eyes were included in this prospective study. The hyperprolate cornea group with an aberration-free monofocal IOL had statistically significant better DCNVA at 33cm (p<0.01) and higher visual acuity over a defocus range of +2.50 to -4.00D. In normal eyes, DCNVA at 33cm was 0.370.04logMAR for the aberration free IOL group and 0.440.07logMAR for the negative spherical IOL (p=0.02). Ray-tracing analysis showed higher EROF in hyperprolate corneas. The hyperprolate cornea group had the highest pseudoaccommodation index (p=0.04) and higher negative spherical aberration (p=0.02). There were no differences in true accommodation (p=0.75) among the groups.
Conclusions:
Pseudoaccommodation from changes in spherical aberration and residual higher-order aberrations may contribute to near vision functionality observed in pseudophakic eyes. The monofocal aberration free IOL behaved as an EDOF IOL in patients with hyperprolate corneas.
Financial Disclosure:
None
