Posters

Static and dynamic factors associated with extended range of vision in aberration-free and negative spherical aberration intraocular lenses

Poster Details

First Author: L.Gouvea USA

Co Author(s):    J. Haddad   G. Waring   K. Rocha              

Abstract Details

Purpose:

To evaluate subjective depth of focus (DoF) curves and static and dynamic factors that influence pseudoaccommodation in aspheric intraocular lenses (IOLs) in normal and hyperprolate corneas using Scheimpflug tomography and ray-tracing aberrometry.

Setting:

Medical University of South Carolina

Methods:

Ray-tracing aberrometry was used to objectively measure DoF in normal and hyperprolate corneas implanted with an aberration-free IOL (Mx60E, Bausch&Lomb), and in normal eyes implanted with a negative spherical aberration IOL (ZCBOO, J&J) at 1-3 months postoperatively. Corneal higher-order aberrations and corneal asphericity for a 6mm pupil size were measured by Scheimpflug tomography. Ray-tracing aberrometry static and dynamic metrics were analyzed, including lower and higher-order aberrations, Visual Strehl of the Optical Transfer Function (VSOTF), Extended Range of Focus (EROF), pseudoaccommodation and accommodation range index (sphere shift). Distance-corrected near visual acuity (DCNVA) and subjective defocus curves were evaluated.

Results:

111 eyes were included in this study. Multivariable logistic regression found only IOL type and corneal profile to be determinants of extended depth of focus with monofocal IOLs. The hyperprolate cornea group implanted with an aberration-free monofocal IOL had statistically significant better DCNVA at 33cm (p<0.01), higher visual acuity over a defocus range of +2.50 to -4.00D, higher negative SA, coma and Q value (p<0.05), and smaller pupil size (p=0.05) compared with normal eyes implanted with an aberration free IOL. The aberration-free IOL group showed significantly better DCNVA and higher SA compared to the negative-SA group. Ray-tracing analysis showed no statistically significant difference in EROF, pseudoaccommodation, or sphere shift (p>0.05) among the groups.

Conclusions:

Pseudoaccommodation from changes in spherical aberration and residual higher-order aberrations may improve near vision acuity in pseudophakic eyes. Type of IOL implanted and corneal profile were the most essential factors influencing near visual acuity in monofocal IOLs.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a competing company, research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented