The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser

The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser

Manoj Motwani Motwani LASIK Institute, San Diego, CA, USA Purpose: To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. Patients and methods: Four eyes of three patients were treated primarily with WaveLight® EX500 wavefront optimized...

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Autor principal: Motwani M
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2017
Materias:
Astigmatism
corneal aberration
excimer laser
refractive surgery
Ophthalmology
RE1-994
Acceso en línea:https://doaj.org/article/da16f31a297a4378a225378fcb8fad5c
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spelling oai:doaj.org-article:da16f31a297a4378a225378fcb8fad5c2021-12-02T00:21:45ZThe use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser1177-5483https://doaj.org/article/da16f31a297a4378a225378fcb8fad5c2017-05-01T00:00:00Zhttps://www.dovepress.com/the-use-of-wavelightreg-contoura-to-create-a-uniform-cornea-the-lyra-p-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Manoj Motwani Motwani LASIK Institute, San Diego, CA, USA Purpose: To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. Patients and methods: Four eyes of three patients were treated primarily with WaveLight® EX500 wavefront optimized (WFO) treatments for astigmatism. All four eyes needed enhancements and were analyzed retrospectively via WaveLight® Contoura to determine the reason for the incorrect astigmatism treatment. Two of the eyes were retreated with topographic-guided ablation, and two were treated with WFO correction. Results: The eyes that had an incorrect manifest axis resulted in a new abnormal induced astigmatism on a wholly new axis. Treatment with topographic-guided ablation completely eliminated the newly induced astigmatism. Treatment with WFO of an abnormal induced astigmatism corrected the refraction but still left topographic evidence of the abnormal astigmatism behind. One eye was incorrectly treated for astigmatism due to coma affecting refraction when the patient was dilated. This eye had a normal induced astigmatism on a perpendicular axis and was corrected using WFO. The use of manifest refraction with WaveLight® Contoura topographic-guided ablation will lead to incorrect astigmatism correction when the manifest astigmatism and axis differ from the WaveLight® Contoura measured. Conclusion: Correction of an incorrect manifest refraction astigmatic axis does not simply create undercorrection of the astigmatism but induces an entirely new abnormal astigmatism on a different axis. Manifest refraction is less accurate and can lead to abnormal astigmatism when laser ablation is performed. Keywords: WaveLight Contoura, astigmatism treatment, asymmetric astigmatism, topographic guide ablation, higher order aberrations, Contoura with LYRA Protocol, LASIK, PRKMotwani MDove Medical PressarticleAstigmatismcorneal aberrationexcimer laserrefractive surgeryOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 11, Pp 907-913 (2017)
institution DOAJ
collection DOAJ
language EN
topic Astigmatism
corneal aberration
excimer laser
refractive surgery
Ophthalmology
RE1-994
spellingShingle Astigmatism
corneal aberration
excimer laser
refractive surgery
Ophthalmology
RE1-994
Motwani M
The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
description Manoj Motwani Motwani LASIK Institute, San Diego, CA, USA Purpose: To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. Patients and methods: Four eyes of three patients were treated primarily with WaveLight® EX500 wavefront optimized (WFO) treatments for astigmatism. All four eyes needed enhancements and were analyzed retrospectively via WaveLight® Contoura to determine the reason for the incorrect astigmatism treatment. Two of the eyes were retreated with topographic-guided ablation, and two were treated with WFO correction. Results: The eyes that had an incorrect manifest axis resulted in a new abnormal induced astigmatism on a wholly new axis. Treatment with topographic-guided ablation completely eliminated the newly induced astigmatism. Treatment with WFO of an abnormal induced astigmatism corrected the refraction but still left topographic evidence of the abnormal astigmatism behind. One eye was incorrectly treated for astigmatism due to coma affecting refraction when the patient was dilated. This eye had a normal induced astigmatism on a perpendicular axis and was corrected using WFO. The use of manifest refraction with WaveLight® Contoura topographic-guided ablation will lead to incorrect astigmatism correction when the manifest astigmatism and axis differ from the WaveLight® Contoura measured. Conclusion: Correction of an incorrect manifest refraction astigmatic axis does not simply create undercorrection of the astigmatism but induces an entirely new abnormal astigmatism on a different axis. Manifest refraction is less accurate and can lead to abnormal astigmatism when laser ablation is performed. Keywords: WaveLight Contoura, astigmatism treatment, asymmetric astigmatism, topographic guide ablation, higher order aberrations, Contoura with LYRA Protocol, LASIK, PRK
format article
author Motwani M
author_facet Motwani M
author_sort Motwani M
title The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
title_short The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
title_full The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
title_fullStr The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
title_full_unstemmed The use of WaveLight® Contoura to create a uniform cornea: the LYRA Protocol. Part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
title_sort use of wavelight® contoura to create a uniform cornea: the lyra protocol. part 2: the consequences of treating astigmatism on an incorrect axis via excimer laser
publisher Dove Medical Press
publishDate 2017
url https://doaj.org/article/da16f31a297a4378a225378fcb8fad5c
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