Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy

Purpose. To analyze the risk factors associated with a series of ectasia cases following photorefractive keratectomy (PRK) and all published cases. Methods. In a retrospective study on post-PRK ectasia patients, 9 eyes of 7 patients were included, in addition to 20 eyes of 13 patients from the liter...

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Main Authors: Nir Sorkin, Igor Kaiserman, Yuval Domniz, Tzahi Sela, Gur Munzer, David Varssano
Format: Article
Language:English
Published: Wiley 2017-01-01
Series:Journal of Ophthalmology
Online Access:http://dx.doi.org/10.1155/2017/2434830
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author Nir Sorkin
Igor Kaiserman
Yuval Domniz
Tzahi Sela
Gur Munzer
David Varssano
author_facet Nir Sorkin
Igor Kaiserman
Yuval Domniz
Tzahi Sela
Gur Munzer
David Varssano
author_sort Nir Sorkin
collection DOAJ
description Purpose. To analyze the risk factors associated with a series of ectasia cases following photorefractive keratectomy (PRK) and all published cases. Methods. In a retrospective study on post-PRK ectasia patients, 9 eyes of 7 patients were included, in addition to 20 eyes of 13 patients from the literature. Risk of post-PRK ectasia was calculated using the ectasia risk score system (ERSS) for laser in situ keratomileusis (LASIK) patients. The percent tissue altered (PTA) was also evaluated. Results. ERSS scoring of zero for age, RSB, and spherical equivalent was found in 66%, 86%, and 86% of the eyes, respectively. Pachymetry risk score was 2 in 60% of the eyes and 3 or 4 in 16% of the eyes. Topography risk score was 3 in 41% of the eyes and 4 in 21% of the eyes. Cumulative ectasia risk score was ≥4 (high risk) in 77% of the eyes and ≥3 (medium and high risk) in 86% of the eyes. Average PTA was 23.2 ± 7.0%. All eyes but one had a PTA < 40%. Conclusions. Preoperative corneal topographic abnormalities and thin corneas may be significant risk factors for developing ectasia following PRK. Post-LASIK ectasia risk scoring also has relevance in the risk for developing post-PRK ectasia.
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spelling doaj-art-f80344e635fe4a118f6f646f180260b32025-02-03T01:02:12ZengWileyJournal of Ophthalmology2090-004X2090-00582017-01-01201710.1155/2017/24348302434830Risk Assessment for Corneal Ectasia following Photorefractive KeratectomyNir Sorkin0Igor Kaiserman1Yuval Domniz2Tzahi Sela3Gur Munzer4David Varssano5Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Affiliated to the Sackler School of Medicine, Tel Aviv University, Tel Aviv, IsraelCare Laser Inc., Tel Aviv, IsraelCare Laser Inc., Tel Aviv, IsraelCare Laser Inc., Tel Aviv, IsraelCare Laser Inc., Tel Aviv, IsraelDepartment of Ophthalmology, Tel Aviv Sourasky Medical Center, Affiliated to the Sackler School of Medicine, Tel Aviv University, Tel Aviv, IsraelPurpose. To analyze the risk factors associated with a series of ectasia cases following photorefractive keratectomy (PRK) and all published cases. Methods. In a retrospective study on post-PRK ectasia patients, 9 eyes of 7 patients were included, in addition to 20 eyes of 13 patients from the literature. Risk of post-PRK ectasia was calculated using the ectasia risk score system (ERSS) for laser in situ keratomileusis (LASIK) patients. The percent tissue altered (PTA) was also evaluated. Results. ERSS scoring of zero for age, RSB, and spherical equivalent was found in 66%, 86%, and 86% of the eyes, respectively. Pachymetry risk score was 2 in 60% of the eyes and 3 or 4 in 16% of the eyes. Topography risk score was 3 in 41% of the eyes and 4 in 21% of the eyes. Cumulative ectasia risk score was ≥4 (high risk) in 77% of the eyes and ≥3 (medium and high risk) in 86% of the eyes. Average PTA was 23.2 ± 7.0%. All eyes but one had a PTA < 40%. Conclusions. Preoperative corneal topographic abnormalities and thin corneas may be significant risk factors for developing ectasia following PRK. Post-LASIK ectasia risk scoring also has relevance in the risk for developing post-PRK ectasia.http://dx.doi.org/10.1155/2017/2434830
spellingShingle Nir Sorkin
Igor Kaiserman
Yuval Domniz
Tzahi Sela
Gur Munzer
David Varssano
Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
Journal of Ophthalmology
title Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
title_full Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
title_fullStr Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
title_full_unstemmed Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
title_short Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
title_sort risk assessment for corneal ectasia following photorefractive keratectomy
url http://dx.doi.org/10.1155/2017/2434830
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