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Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy

PURPOSE: To compare the corneal power measurements obtained using different topographic instruments after myopic photorefractive keratectomy (PRK). METHODS: Patients with myopia who were candidates for corneal refractive surgery were sequentially included. Pre-PRK and six months post-PRK corneal pow...

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Autores principales: Baradaran-Rafii, Alireza, Fekri, Sahba, Rezaie, Mohammad, Salehi-Rad, Shahram, Moradi, Ali, Motevasseli, Tahmineh, Kalantarion, Masumeh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5525492/
https://www.ncbi.nlm.nih.gov/pubmed/28791056
http://dx.doi.org/10.4103/jovr.jovr_74_16
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author Baradaran-Rafii, Alireza
Fekri, Sahba
Rezaie, Mohammad
Salehi-Rad, Shahram
Moradi, Ali
Motevasseli, Tahmineh
Kalantarion, Masumeh
author_facet Baradaran-Rafii, Alireza
Fekri, Sahba
Rezaie, Mohammad
Salehi-Rad, Shahram
Moradi, Ali
Motevasseli, Tahmineh
Kalantarion, Masumeh
author_sort Baradaran-Rafii, Alireza
collection PubMed
description PURPOSE: To compare the corneal power measurements obtained using different topographic instruments after myopic photorefractive keratectomy (PRK). METHODS: Patients with myopia who were candidates for corneal refractive surgery were sequentially included. Pre-PRK and six months post-PRK corneal powers were measured using Javal manual keratometer, Orbscan II, Galilei, Tomey TMS4, and EyeSys 2000 topographers. Measured values were compared with those obtained using the clinical history method (CHM). RESULTS: This study included 66 eyes of 33 patients. The lowest keratometric measurements were obtained using the Galilei topographer (42.98 ± 1.69 diopters, D) and the highest measurements were obtained using the Javal manual keratometer (43.96 ± 1.54 D) preoperatively. The same order was observed postoperatively. Effective refractive power (EffRP) measured using EyeSys was most similar to the values obtained using CHM (ICC, intraclass correlation coefficient = 0.951), followed by the total corneal power measured using the Galilei system (ICC = 0.943). The values obtained using the adjusted EffRP formula (EffRP – 0.015*Δ Refraction – 0.05) were more consistent with the values obtained using CHM (ICC = 0.954) compared to those obtained with the adjusted average central corneal power formula measured using the Tomey system (ICC = 0.919). CONCLUSION: Post-PRK corneal powers measured using the adjusted EffRP formula were the most similar to values obtained using CHM.
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spelling pubmed-55254922017-08-08 Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy Baradaran-Rafii, Alireza Fekri, Sahba Rezaie, Mohammad Salehi-Rad, Shahram Moradi, Ali Motevasseli, Tahmineh Kalantarion, Masumeh J Ophthalmic Vis Res Original Article PURPOSE: To compare the corneal power measurements obtained using different topographic instruments after myopic photorefractive keratectomy (PRK). METHODS: Patients with myopia who were candidates for corneal refractive surgery were sequentially included. Pre-PRK and six months post-PRK corneal powers were measured using Javal manual keratometer, Orbscan II, Galilei, Tomey TMS4, and EyeSys 2000 topographers. Measured values were compared with those obtained using the clinical history method (CHM). RESULTS: This study included 66 eyes of 33 patients. The lowest keratometric measurements were obtained using the Galilei topographer (42.98 ± 1.69 diopters, D) and the highest measurements were obtained using the Javal manual keratometer (43.96 ± 1.54 D) preoperatively. The same order was observed postoperatively. Effective refractive power (EffRP) measured using EyeSys was most similar to the values obtained using CHM (ICC, intraclass correlation coefficient = 0.951), followed by the total corneal power measured using the Galilei system (ICC = 0.943). The values obtained using the adjusted EffRP formula (EffRP – 0.015*Δ Refraction – 0.05) were more consistent with the values obtained using CHM (ICC = 0.954) compared to those obtained with the adjusted average central corneal power formula measured using the Tomey system (ICC = 0.919). CONCLUSION: Post-PRK corneal powers measured using the adjusted EffRP formula were the most similar to values obtained using CHM. Medknow Publications & Media Pvt Ltd 2017 /pmc/articles/PMC5525492/ /pubmed/28791056 http://dx.doi.org/10.4103/jovr.jovr_74_16 Text en Copyright: © 2017 Journal of Ophthalmic and Vision Research http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.
spellingShingle Original Article
Baradaran-Rafii, Alireza
Fekri, Sahba
Rezaie, Mohammad
Salehi-Rad, Shahram
Moradi, Ali
Motevasseli, Tahmineh
Kalantarion, Masumeh
Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title_full Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title_fullStr Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title_full_unstemmed Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title_short Accuracy of Different Topographic Instruments in Calculating Corneal Power after Myopic Photorefractive Keratectomy
title_sort accuracy of different topographic instruments in calculating corneal power after myopic photorefractive keratectomy
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5525492/
https://www.ncbi.nlm.nih.gov/pubmed/28791056
http://dx.doi.org/10.4103/jovr.jovr_74_16
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