Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D

Steven M Christiansen,1 Mark D Mifflin,1 Jason N Edmonds,1 Rachel G Simpson,2 Majid Moshirfar11John A Moran Eye Center, University of Utah, Salt Lake City, UT, 2The University of Arizona College of Medicine, Phoenix, AZ, USABackground: The purpose of this study was to evaluate surgically-induced ast...

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Autores principales: Christiansen SM, Mifflin MD, Edmonds JN, Simpson RG, Moshirfar M
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Publicado: Dove Medical Press 2012
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spelling oai:doaj.org-article:6ec09b5945cb404281bbe8d8830a83d22021-12-02T06:49:42ZAstigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D1177-54671177-5483https://doaj.org/article/6ec09b5945cb404281bbe8d8830a83d22012-12-01T00:00:00Zhttp://www.dovepress.com/astigmatism-induced-by-conventional-spherical-ablation-after-prk-and-l-a11796https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Steven M Christiansen,1 Mark D Mifflin,1 Jason N Edmonds,1 Rachel G Simpson,2 Majid Moshirfar11John A Moran Eye Center, University of Utah, Salt Lake City, UT, 2The University of Arizona College of Medicine, Phoenix, AZ, USABackground: The purpose of this study was to evaluate surgically-induced astigmatism after spherical ablation in photorefractive keratectomy (PRK) and laser-assisted in situ keratomileusis (LASIK) for myopia with astigmatism < 1.00 D.Methods: The charts of patients undergoing spherical PRK or LASIK for the correction of myopia with minimal astigmatism of <1.00 D from 2002 to 2012 at the John A Moran Eye Center in Salt Lake City, UT, were retrospectively reviewed. Astigmatism was measured by manifest refraction. The final astigmatic refractive outcome at 6 months postoperatively was compared with the initial refraction by Alpins vector analysis.Results: For PRK, average cylinder increased from 0.39 ± 0.25 (0.00–0.75) preoperatively to 0.55 ± 0.48 (0.00–1.75) postoperatively (P = 0.014), compared with an increase in LASIK eyes from 0.40 ± 0.27 (0.00–0.75) preoperatively to 0.52 ± 0.45 (0.00–2.00) postoperatively (P = 0.041). PRK eyes experienced an absolute value change in cylinder of 0.41 ± 0.32 (0.00–1.50) and LASIK eyes experienced a change of 0.41 ± 0.31 (0.00–1.50, P = 0.955). Mean surgically-induced astigmatism was 0.59 ± 0.35 (0.00–1.70) in PRK eyes, with an increase in surgically-induced astigmatism of 0.44 D for each additional 1.00 D of preoperative cylinder; in LASIK eyes, mean surgically-induced astigmatism was 0.55 ± 0.32 (0.00–1.80, P = 0.482), with an increase in surgically-induced astigmatism of 0.29 D for each 1.00 D of preoperative cylinder.Conclusion: Spherical ablation can induce substantial astigmatism even in eyes with less than one diopter of preoperative astigmatism in both PRK and LASIK. No significant difference in the magnitude of surgically-induced astigmatism was found between eyes treated with PRK and LASIK, although surgically-induced astigmatism was found to increase with greater levels of preoperative astigmatism in both PRK and LASIK.Keywords: surgically-induced astigmatism, ablation, photorefractive keratectomy, laser-assisted in situ keratomileusisChristiansen SMMifflin MDEdmonds JNSimpson RGMoshirfar MDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2012, Iss default, Pp 2109-2117 (2012)
institution DOAJ
collection DOAJ
language EN
topic Ophthalmology
RE1-994
spellingShingle Ophthalmology
RE1-994
Christiansen SM
Mifflin MD
Edmonds JN
Simpson RG
Moshirfar M
Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
description Steven M Christiansen,1 Mark D Mifflin,1 Jason N Edmonds,1 Rachel G Simpson,2 Majid Moshirfar11John A Moran Eye Center, University of Utah, Salt Lake City, UT, 2The University of Arizona College of Medicine, Phoenix, AZ, USABackground: The purpose of this study was to evaluate surgically-induced astigmatism after spherical ablation in photorefractive keratectomy (PRK) and laser-assisted in situ keratomileusis (LASIK) for myopia with astigmatism < 1.00 D.Methods: The charts of patients undergoing spherical PRK or LASIK for the correction of myopia with minimal astigmatism of <1.00 D from 2002 to 2012 at the John A Moran Eye Center in Salt Lake City, UT, were retrospectively reviewed. Astigmatism was measured by manifest refraction. The final astigmatic refractive outcome at 6 months postoperatively was compared with the initial refraction by Alpins vector analysis.Results: For PRK, average cylinder increased from 0.39 ± 0.25 (0.00–0.75) preoperatively to 0.55 ± 0.48 (0.00–1.75) postoperatively (P = 0.014), compared with an increase in LASIK eyes from 0.40 ± 0.27 (0.00–0.75) preoperatively to 0.52 ± 0.45 (0.00–2.00) postoperatively (P = 0.041). PRK eyes experienced an absolute value change in cylinder of 0.41 ± 0.32 (0.00–1.50) and LASIK eyes experienced a change of 0.41 ± 0.31 (0.00–1.50, P = 0.955). Mean surgically-induced astigmatism was 0.59 ± 0.35 (0.00–1.70) in PRK eyes, with an increase in surgically-induced astigmatism of 0.44 D for each additional 1.00 D of preoperative cylinder; in LASIK eyes, mean surgically-induced astigmatism was 0.55 ± 0.32 (0.00–1.80, P = 0.482), with an increase in surgically-induced astigmatism of 0.29 D for each 1.00 D of preoperative cylinder.Conclusion: Spherical ablation can induce substantial astigmatism even in eyes with less than one diopter of preoperative astigmatism in both PRK and LASIK. No significant difference in the magnitude of surgically-induced astigmatism was found between eyes treated with PRK and LASIK, although surgically-induced astigmatism was found to increase with greater levels of preoperative astigmatism in both PRK and LASIK.Keywords: surgically-induced astigmatism, ablation, photorefractive keratectomy, laser-assisted in situ keratomileusis
format article
author Christiansen SM
Mifflin MD
Edmonds JN
Simpson RG
Moshirfar M
author_facet Christiansen SM
Mifflin MD
Edmonds JN
Simpson RG
Moshirfar M
author_sort Christiansen SM
title Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
title_short Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
title_full Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
title_fullStr Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
title_full_unstemmed Astigmatism induced by conventional spherical ablation after PRK and LASIK in myopia with astigmatism < 1.00 D
title_sort astigmatism induced by conventional spherical ablation after prk and lasik in myopia with astigmatism < 1.00 d
publisher Dove Medical Press
publishDate 2012
url https://doaj.org/article/6ec09b5945cb404281bbe8d8830a83d2
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