Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye

Tsutomu Ohashi,1 Takashi Kojima2 1Ohashi Eye Center, Sapporo, Japan; 2Department of Ophthalmology, Keio University School of Medicine, Tokyo, JapanCorrespondence: Tsutomu OhashiOhashi Eye Center, Kita1-1 Hondori6, Shiroishi, Sapporo 003-0027, JapanTel +81-11-864-4656Fax +81-11-864-2344Email Ohashi@r...

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Autores principales:	Ohashi T, Kojima T
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	cataract surgery image-guided system steep meridian manual method Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/df39d4aff4ff47dfb2b814d1ebaee94a
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spelling	oai:doaj.org-article:df39d4aff4ff47dfb2b814d1ebaee94a2021-12-02T10:48:25ZComparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye1177-5483https://doaj.org/article/df39d4aff4ff47dfb2b814d1ebaee94a2020-12-01T00:00:00Zhttps://www.dovepress.com/comparison-of-the-orientation-of-the-corneal-steep-meridian-determined-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Tsutomu Ohashi,1 Takashi Kojima2 1Ohashi Eye Center, Sapporo, Japan; 2Department of Ophthalmology, Keio University School of Medicine, Tokyo, JapanCorrespondence: Tsutomu OhashiOhashi Eye Center, Kita1-1 Hondori6, Shiroishi, Sapporo 003-0027, JapanTel +81-11-864-4656Fax +81-11-864-2344Email Ohashi@rainbow.ne.jpPurpose: To evaluate the difference between the preoperative marking methods for toric intraocular lens (IOL) implantations using an image-guided system (IGS) and the manual marking method in the same eye.Patients and Methods: In this retrospective case series, 82 patients (101 eyes) who underwent cataract surgery using both manual and IGS (VERION, Alcon  Laboratories) marking were enrolled. First, preoperative reference marks were placed at 6 o’clock and 3 or 9 o’clock position under slit-lamp biomicroscope in the outpatient department using the manual method. Using the reference unit of IGS, the ocular surface data were captured and overlaid. The difference was then measured (preoperative axis misalignment). In the operating room, the orientation of the steep meridian of the manual method was determined based on this reference mark under the surgical microscope. Just before surgery, the digital degree gauge of IGS was overlaid on the ocular surface, and the difference was then measured (total axis misalignment). We calculated the intraoperative axis misalignment by subtracting preoperative axis misalignment from the total axis misalignment.Results: Mean absolute preoperative, intraoperative, and total axis misalignment values were 3.87± 3.95 degrees, 5.46± 4.42 degrees, and 4.98± 4.49 degrees, respectively. In preoperative, intraoperative, and total misalignment, the ratios of 10 degrees or greater were 10 (14.7%), 12 (17.6%), and 20 (19.8%) eyes, respectively.Conclusion: The manual method that determines the fixed position of the toric intraocular lens (IOL) may cause large misalignment compared with the IGS, suggesting that using manual method could sometimes result in a large misalignment of toric IOL implantation.Keywords: cataract surgery, image-guided system, steep meridian, manual methodOhashi TKojima TDove Medical Pressarticlecataract surgeryimage-guided systemsteep meridianmanual methodOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 4135-4144 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	cataract surgery image-guided system steep meridian manual method Ophthalmology RE1-994
spellingShingle	cataract surgery image-guided system steep meridian manual method Ophthalmology RE1-994 Ohashi T Kojima T Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
description	Tsutomu Ohashi,1 Takashi Kojima2 1Ohashi Eye Center, Sapporo, Japan; 2Department of Ophthalmology, Keio University School of Medicine, Tokyo, JapanCorrespondence: Tsutomu OhashiOhashi Eye Center, Kita1-1 Hondori6, Shiroishi, Sapporo 003-0027, JapanTel +81-11-864-4656Fax +81-11-864-2344Email Ohashi@rainbow.ne.jpPurpose: To evaluate the difference between the preoperative marking methods for toric intraocular lens (IOL) implantations using an image-guided system (IGS) and the manual marking method in the same eye.Patients and Methods: In this retrospective case series, 82 patients (101 eyes) who underwent cataract surgery using both manual and IGS (VERION, Alcon  Laboratories) marking were enrolled. First, preoperative reference marks were placed at 6 o’clock and 3 or 9 o’clock position under slit-lamp biomicroscope in the outpatient department using the manual method. Using the reference unit of IGS, the ocular surface data were captured and overlaid. The difference was then measured (preoperative axis misalignment). In the operating room, the orientation of the steep meridian of the manual method was determined based on this reference mark under the surgical microscope. Just before surgery, the digital degree gauge of IGS was overlaid on the ocular surface, and the difference was then measured (total axis misalignment). We calculated the intraoperative axis misalignment by subtracting preoperative axis misalignment from the total axis misalignment.Results: Mean absolute preoperative, intraoperative, and total axis misalignment values were 3.87± 3.95 degrees, 5.46± 4.42 degrees, and 4.98± 4.49 degrees, respectively. In preoperative, intraoperative, and total misalignment, the ratios of 10 degrees or greater were 10 (14.7%), 12 (17.6%), and 20 (19.8%) eyes, respectively.Conclusion: The manual method that determines the fixed position of the toric intraocular lens (IOL) may cause large misalignment compared with the IGS, suggesting that using manual method could sometimes result in a large misalignment of toric IOL implantation.Keywords: cataract surgery, image-guided system, steep meridian, manual method
format	article
author	Ohashi T Kojima T
author_facet	Ohashi T Kojima T
author_sort	Ohashi T
title	Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
title_short	Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
title_full	Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
title_fullStr	Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
title_full_unstemmed	Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye
title_sort	comparison of the orientation of the corneal steep meridian determined by image-guided system and manual method in the same eye
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/df39d4aff4ff47dfb2b814d1ebaee94a
work_keys_str_mv	AT ohashit comparisonoftheorientationofthecornealsteepmeridiandeterminedbyimageguidedsystemandmanualmethodinthesameeye AT kojimat comparisonoftheorientationofthecornealsteepmeridiandeterminedbyimageguidedsystemandmanualmethodinthesameeye
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Comparison of the Orientation of the Corneal Steep Meridian Determined by Image-Guided System and Manual Method in the Same Eye

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