$Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism$
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Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

Rania E Gad,1 Mohamed Hosny,2 Rania A Ahmed,2 Ahmed M Sherif,2 Yehia Salah Eldin2 1Ophthalmology Department, Helwan University, Cairo, Egypt; 2Ophthalmology Department, Cairo University, Cairo, EgyptCorrespondence: Rania E GadDepartment of Ophthalmology, Helwan University, Ain Helwan, PO Box 11795,...

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Autores principales:	Gad RE, Hosny M, Ahmed RA, Sherif AM, Salah Eldin Y
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2021
Materias:	topography q value photorefractive keratectomy myopia astigmatism Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/6cfdd16eb73a4cf0bc05c77086527eeb
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spelling	oai:doaj.org-article:6cfdd16eb73a4cf0bc05c77086527eeb2021-12-02T13:40:23ZContralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism1177-5483https://doaj.org/article/6cfdd16eb73a4cf0bc05c77086527eeb2021-04-01T00:00:00Zhttps://www.dovepress.com/contralateral-eye-study-of-topography-guided-versus-q-value-adjusted-p-peer-reviewed-fulltext-article-OPTHhttps://doaj.org/toc/1177-5483Rania E Gad,1 Mohamed Hosny,2 Rania A Ahmed,2 Ahmed M Sherif,2 Yehia Salah Eldin2 1Ophthalmology Department, Helwan University, Cairo, Egypt; 2Ophthalmology Department, Cairo University, Cairo, EgyptCorrespondence: Rania E GadDepartment of Ophthalmology, Helwan University, Ain Helwan, PO Box 11795, Cairo, EgyptEmail rania.gad@med.helwan.edu.egPurpose of the Study: To compare visual outcome, higher order aberrations (HOAs) of topography guided and Q value adjusted ablation in the fellow eye of patients undergoing photorefractive keratectomy (PRK) for the correction of myopia and myopic astigmatism.Methods: Prospective randomized controlled interventional clinical study. The eyes of 52 patients undergoing PRK for myopia and astigmatism were included, that is, 104 eyes in total. In each patient, eyes were randomly allocated to group I: one eye received topography guided PRK using Contoura ablation software, or group II: the other eye received Q value adjusted PRK using Custom Q ablation software.Follow-Up: Six months.Results: At the end of 6 months, LogMAR UDVA was − 0.04 ± 0.12 and − 0.05 ± 0.11 (p = 0.688), while LogMAR CDVA was − 0.06 ± 0.09 and − 0.06 ± 0.1 in group I and group II, respectively (p = 0.972). Both groups showed a progressive oblate shift with time. This oblate shift was insignificantly less in group I by Topolyzer at 6mm, 15° and 30° at 6 months (p = 0.102, p = 0.138, p = 0.245, respectively). Topolyzer identified a significant difference between the change in coma and trefoil in both groups at 6 months (p< 0.001 and p = 0.001, respectively). This was caused by the significant worsening of coma in group II (p< 0.001) and the significant improvement of trefoil in group I (p = 0.007). No significant difference was found between groups in the change of ISV or ABR (p = 0.955 and 0.982, respectively). Ablation depth is a significant predictor of ΔQ at 6mm, 15° and 30° (p = 0.009, 0.039 and 0, respectively). No significant difference was found in the Strehl ratio or contrast sensitivity, although they were insignificantly better in group I (p = 0.785 and p = 0.745, respectively).Conclusion: TG PRK and CQ PRK yielded similar results regarding UDVA, CDVA, MRSE, safety, predictability and contrast sensitivity. Both groups showed a progressive oblate shift, which was less in the TG group but the difference was statistically insignificant. TG PRK showed significantly improved trefoil HOA as compared to CQ PRK.Keywords: topography, Q value, photorefractive keratectomy, myopia, astigmatismGad REHosny MAhmed RASherif AMSalah Eldin YDove Medical Pressarticletopographyq valuephotorefractive keratectomymyopiaastigmatismOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 15, Pp 1735-1749 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	topography q value photorefractive keratectomy myopia astigmatism Ophthalmology RE1-994
spellingShingle	topography q value photorefractive keratectomy myopia astigmatism Ophthalmology RE1-994 Gad RE Hosny M Ahmed RA Sherif AM Salah Eldin Y Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
description	Rania E Gad,1 Mohamed Hosny,2 Rania A Ahmed,2 Ahmed M Sherif,2 Yehia Salah Eldin2 1Ophthalmology Department, Helwan University, Cairo, Egypt; 2Ophthalmology Department, Cairo University, Cairo, EgyptCorrespondence: Rania E GadDepartment of Ophthalmology, Helwan University, Ain Helwan, PO Box 11795, Cairo, EgyptEmail rania.gad@med.helwan.edu.egPurpose of the Study: To compare visual outcome, higher order aberrations (HOAs) of topography guided and Q value adjusted ablation in the fellow eye of patients undergoing photorefractive keratectomy (PRK) for the correction of myopia and myopic astigmatism.Methods: Prospective randomized controlled interventional clinical study. The eyes of 52 patients undergoing PRK for myopia and astigmatism were included, that is, 104 eyes in total. In each patient, eyes were randomly allocated to group I: one eye received topography guided PRK using Contoura ablation software, or group II: the other eye received Q value adjusted PRK using Custom Q ablation software.Follow-Up: Six months.Results: At the end of 6 months, LogMAR UDVA was − 0.04 ± 0.12 and − 0.05 ± 0.11 (p = 0.688), while LogMAR CDVA was − 0.06 ± 0.09 and − 0.06 ± 0.1 in group I and group II, respectively (p = 0.972). Both groups showed a progressive oblate shift with time. This oblate shift was insignificantly less in group I by Topolyzer at 6mm, 15° and 30° at 6 months (p = 0.102, p = 0.138, p = 0.245, respectively). Topolyzer identified a significant difference between the change in coma and trefoil in both groups at 6 months (p< 0.001 and p = 0.001, respectively). This was caused by the significant worsening of coma in group II (p< 0.001) and the significant improvement of trefoil in group I (p = 0.007). No significant difference was found between groups in the change of ISV or ABR (p = 0.955 and 0.982, respectively). Ablation depth is a significant predictor of ΔQ at 6mm, 15° and 30° (p = 0.009, 0.039 and 0, respectively). No significant difference was found in the Strehl ratio or contrast sensitivity, although they were insignificantly better in group I (p = 0.785 and p = 0.745, respectively).Conclusion: TG PRK and CQ PRK yielded similar results regarding UDVA, CDVA, MRSE, safety, predictability and contrast sensitivity. Both groups showed a progressive oblate shift, which was less in the TG group but the difference was statistically insignificant. TG PRK showed significantly improved trefoil HOA as compared to CQ PRK.Keywords: topography, Q value, photorefractive keratectomy, myopia, astigmatism
format	article
author	Gad RE Hosny M Ahmed RA Sherif AM Salah Eldin Y
author_facet	Gad RE Hosny M Ahmed RA Sherif AM Salah Eldin Y
author_sort	Gad RE
title	Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
title_short	Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
title_full	Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
title_fullStr	Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
title_full_unstemmed	Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism
title_sort	contralateral eye study of topography guided versus q value adjusted photorefractive keratectomy in myopia and myopic astigmatism
publisher	Dove Medical Press
publishDate	2021
url	https://doaj.org/article/6cfdd16eb73a4cf0bc05c77086527eeb
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Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

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