Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking

Mortada Ahmed Abozaid,1 Abdelsalam Abdalla2 1Faculty of Medicine, Sohag University, Sohag, Egypt; 2Faculty of Medicine, Assiut University, Assiut, EgyptCorrespondence: Mortada Ahmed AbozaidOphthalmology Department, Faculty of Medicine, Sohag University, Sohag, EgyptTel +20 932 309 244Fax +20 932 325...

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Autores principales:	Abozaid MA, Abdalla A
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	alpins method astigmatic correction in keratoconus kerarings vector analysis Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/2448a1846a8943a58b6b4c320252c12f
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spelling	oai:doaj.org-article:2448a1846a8943a58b6b4c320252c12f2021-12-02T05:35:36ZVector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking1177-5483https://doaj.org/article/2448a1846a8943a58b6b4c320252c12f2020-02-01T00:00:00Zhttps://www.dovepress.com/vector-analysis-of-astigmatism-in-keratoconic-eyes-after-combined-intr-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Mortada Ahmed Abozaid,1 Abdelsalam Abdalla2 1Faculty of Medicine, Sohag University, Sohag, Egypt; 2Faculty of Medicine, Assiut University, Assiut, EgyptCorrespondence: Mortada Ahmed AbozaidOphthalmology Department, Faculty of Medicine, Sohag University, Sohag, EgyptTel +20 932 309 244Fax +20 932 325 531Email mourtada_abdelaal@med.sohag.edu.egPurpose: To analyze astigmatic changes after intrastromal corneal ring segments (ICRSs) implantation accompanied by corneal collagen cross-linking (CXL) in keratoconic eyes using the Alpins vectorial method.Patients and Methods: Twenty-eight eyes of 18 patients with keratoconus were included in this retrospective non-comparative study. All patients had combined femtosecond laser-assisted Keraring implantation and CXL, and completed at least 2 years of follow-up. Both manifest and corneal astigmatic changes were analyzed using the Alpins vectorial parameters based on 3 vectors; target induced astigmatism (TIA), surgically induced astigmatism (SIA) and difference vector (DV).Results: Regarding analysis of manifest astigmatism, the TIA arithmetic mean was 5.22 D while the vector mean was 3.13 D Ax 173. The SIA arithmetic mean was 5.41 D while the vector mean was 2.38 D Ax 173. The DV arithmetic mean was 2.10 D while the vector mean was 0.75 D Ax 175. Regarding analysis of corneal astigmatism, the TIA arithmetic mean was 5.22 D while the vector mean was 3.13 D Ax 173. The SIA arithmetic mean was 5.23 D while the vector mean was 1.8 D Ax 12. The DV arithmetic mean was 4.28 D while the vector mean was 2.04 D Ax 157.Conclusion: Vector analysis of manifest and corneal astigmatism in keratoconic eyes with previous ICRS and CXL reveals more accuracy and predictability of manifest refraction in calculating SIA.Keywords: Alpins method, astigmatic correction in keratoconus, kerarings, vector analysisAbozaid MAAbdalla ADove Medical Pressarticlealpins methodastigmatic correction in keratoconuskeraringsvector analysisOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 473-480 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	alpins method astigmatic correction in keratoconus kerarings vector analysis Ophthalmology RE1-994
spellingShingle	alpins method astigmatic correction in keratoconus kerarings vector analysis Ophthalmology RE1-994 Abozaid MA Abdalla A Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
description	Mortada Ahmed Abozaid,1 Abdelsalam Abdalla2 1Faculty of Medicine, Sohag University, Sohag, Egypt; 2Faculty of Medicine, Assiut University, Assiut, EgyptCorrespondence: Mortada Ahmed AbozaidOphthalmology Department, Faculty of Medicine, Sohag University, Sohag, EgyptTel +20 932 309 244Fax +20 932 325 531Email mourtada_abdelaal@med.sohag.edu.egPurpose: To analyze astigmatic changes after intrastromal corneal ring segments (ICRSs) implantation accompanied by corneal collagen cross-linking (CXL) in keratoconic eyes using the Alpins vectorial method.Patients and Methods: Twenty-eight eyes of 18 patients with keratoconus were included in this retrospective non-comparative study. All patients had combined femtosecond laser-assisted Keraring implantation and CXL, and completed at least 2 years of follow-up. Both manifest and corneal astigmatic changes were analyzed using the Alpins vectorial parameters based on 3 vectors; target induced astigmatism (TIA), surgically induced astigmatism (SIA) and difference vector (DV).Results: Regarding analysis of manifest astigmatism, the TIA arithmetic mean was 5.22 D while the vector mean was 3.13 D Ax 173. The SIA arithmetic mean was 5.41 D while the vector mean was 2.38 D Ax 173. The DV arithmetic mean was 2.10 D while the vector mean was 0.75 D Ax 175. Regarding analysis of corneal astigmatism, the TIA arithmetic mean was 5.22 D while the vector mean was 3.13 D Ax 173. The SIA arithmetic mean was 5.23 D while the vector mean was 1.8 D Ax 12. The DV arithmetic mean was 4.28 D while the vector mean was 2.04 D Ax 157.Conclusion: Vector analysis of manifest and corneal astigmatism in keratoconic eyes with previous ICRS and CXL reveals more accuracy and predictability of manifest refraction in calculating SIA.Keywords: Alpins method, astigmatic correction in keratoconus, kerarings, vector analysis
format	article
author	Abozaid MA Abdalla A
author_facet	Abozaid MA Abdalla A
author_sort	Abozaid MA
title	Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
title_short	Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
title_full	Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
title_fullStr	Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
title_full_unstemmed	Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking
title_sort	vector analysis of astigmatism in keratoconic eyes after combined intrastromal corneal ring segments implantation and collagen cross-linking
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/2448a1846a8943a58b6b4c320252c12f
work_keys_str_mv	AT abozaidma vectoranalysisofastigmatisminkeratoconiceyesaftercombinedintrastromalcornealringsegmentsimplantationandcollagencrosslinking AT abdallaa vectoranalysisofastigmatisminkeratoconiceyesaftercombinedintrastromalcornealringsegmentsimplantationandcollagencrosslinking
_version_	1718400339128877056

Vector Analysis of Astigmatism in Keratoconic Eyes After Combined Intrastromal Corneal Ring Segments Implantation and Collagen Cross-Linking

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