Corneal asphericity and spherical aberration after refractive surgery

Corneal asphericity and spherical aberration after refractive surgery

Author Bottos, Katia M. Autor UNIFESP Google Scholar
Leite, Mauro T. Autor UNIFESP Google Scholar
Aventura-Isidro, Marichelle Google Scholar
Bernabe-Ko, Jennifer Google Scholar
Wongpitoonpiya, Noppamas Google Scholar
Ong-Camara, Nikki Heidi Google Scholar
Purcell, Tracy L. Google Scholar
Schanz, David J. Google Scholar
Institution Univ Calif San Diego
Universidade Federal de São Paulo (UNIFESP)
Univ Santo Tomas
Abstract PURPOSE: To evaluate changes in corneal asphericity (Q) and spherical aberrations after refractive surgery using Scheimpflug imaging.SETTING: University of California, San Diego, Shiley Eye Center, La Jolla, California, USA.DESIGN: Cohort study.METHODS: After wavefront-guided laser in situ keratomileusis, patients within +/- 0.50 diopter of piano and with an uncorrected distance visual acuity of at least 20/20 were evaluated. the Q values and corneal spherical aberration Zernike values were obtained using Scheimpflug imaging preoperatively and 1 to 3 months postoperatively.RESULTS: the study enrolled 177 myopic eyes and 32 hyperopic eyes. the mean Q value was -0.28 +/- 0.11 (SD) and -0.22 +/- 0.15, respectively, preoperatively and +0.35 +/- 0.44 and -0.64 +/- 0.31, respectively, postoperatively. the asphericity change was highly correlated with preoperative spherical equivalent (r(2) = 0.81; P <=.001). the mean corneal spherical aberration was +0.21 +/- 0.08 mu m in myopic eyes and +0.36 +/- 0.11 mu m in hyperopic eyes preoperatively and +0.36 +/- 0.17 mu m and 0.00 +/- 0.29 mu m, respectively, postoperatively. the corneal spherical aberration changes were correlated with the amount of preoperative refractive error (r(2) = 0.34; P<.001). There was a tendency for Q values and spherical aberrations to become more positive after myopic ablation and more negative after hyperopic ablation.CONCLUSIONS: Myopic and hyperopic corrections induced changes in the Q value and spherical aberrations in opposite directions (ie, positive and negative, respectively). the changes depended on the magnitude of the refractive correction.
Language English
Sponsor Research to Prevent Blindness, Inc., New York, New York, USA
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Grant number CAPES: BEX 1325/09-4
Date 2011-06-01
Published in Journal of Cataract and Refractive Surgery. New York: Elsevier B.V., v. 37, n. 6, p. 1109-1115, 2011.
ISSN 0886-3350 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 1109-1115
Origin http://dx.doi.org/10.1016/j.jcrs.2010.12.058
Access rights Closed access
Type Article
Web of Science ID WOS:000291714900019
URI http://repositorio.unifesp.br/handle/11600/33760

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