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Article Dans Une Revue Translational Vision Science and Technology Année : 2023

Comparison of low degree/high degree and zernike expansions for evaluating simulation outcomes after customized aspheric laser corrections

Résumé

Purpose: The purpose of this study was to compare the low degree/high degree (LD/HD) and Zernike Expansion simulation outcomes evaluating the corneal wavefront changes after theoretical conventional and customized aspheric photorefractive ablations. Methods: Initial anterior corneal surface profiles were modeled as conic sections with pre-operative apical curvature, R0, and asphericity, Q0. Postoperative apical curvature, R1, was computed from intended defocus correction, D, diameter zone, S, and target postoperative asphericity, Q1. Coefficients of both Zernike and LD/HD polynomial expansions of the rotationally symmetrical corneal profile were computed using scalar products. We modeled different values of D, R0, Q0, S, and Q = Q1 to Q0. The corresponding postoperative changes in defocus (z20 vs. g20), fourth order (z40 vs.g40) and sixth order (z60 vs.g60) Zernike and LD/HD spherical aberrations (SAs) were compared. In addition, retrospective clinical data and wavefront measurements were obtained from two examples of two patient eyes before and after corneal laser photoablation. Results: The z20, varied with both R0 and Q0, whereas the LD/HD defocus coefficient, g20, was relatively robust to changes in asphericity. Variations of apical curvature better correlated with defocus and Q with SA coefficients in the LD/HD classification. The impact ofQ was null on g20 but induced significant linear variations in z20 and fourth order SA coefficients. LD/HD coefficients provided a good correlation with the visual performances of the operated eyes. Conclusions: Simulated variations in postoperative corneal profile and wavefront expansion using the LD/HD approach showed good correlations between defocus and asphericity variations with variations in corneal curvature and SA coefficients, respectively. Translational Relevance: The relevance of this studywas to provide a clinically relevant alternative to Zernike polynomials for the interpretation of wavefront changes after customized aspheric corrections.
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hal-03993042 , version 1 (06-06-2023)

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Damien Gatinel, Jacques Malet, Laurent Dumas, Dimitri T. Azar. Comparison of low degree/high degree and zernike expansions for evaluating simulation outcomes after customized aspheric laser corrections. Translational Vision Science and Technology, 2023, 10 (3), ⟨10.1167/tvst.10.3.21⟩. ⟨hal-03993042⟩
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