Document Detail

Posterior corneal curvature assessment after Epi-LASIK for myopia: comparison of Orbscan II and Pentacam imaging.
MedLine Citation:
PMID:  22323878     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To compare the changes in posterior corneal curvature using scanning slit topography (Orbscan II) and Scheimpflug imaging (Pentacam) before and after Epi-laser in situ keratomileusis (LASIK) for myopia.
METHODS: In a prospective observational case-series study, 20 myopic patients having undergone Epi-LASIK were examined serially with two different devices, Orbscan II and Pentacam, preoperatively and one month postoperatively. Posterior central elevation (PCE) and posterior maximal elevation (PME) were compared between the two devices, and the changes in parameters after Epi-LASIK were analyzed using a difference map.
RESULTS: All parameters (preoperative and postoperative PCE and preoperative and postoperative PME) that were measured using the Orbscan II were significantly greater compared to those of the Pentacam (for all p < 0.001). PCE and PME were significantly increased one month postoperatively in the Orbscan II measurements (p < 0.05) but were not significantly increased in the Pentacam measurements. Also, ΔPCE and ΔPME, in the difference map obtained by each serial scanning, were significantly greater in the Orbscan II measurements than with the Pentacam (p = 0.012, p = 0.016).
CONCLUSIONS: The Pentacam measurements displayed significantly reduced values in all parameters related to posterior corneal elevation compared to those of the Orbscan II. The Pentacam showed no significant change in posterior corneal curvature after Epi-LASIK, based on the difference map.
Yong-Soo Byun; So-Hyang Chung; Young-Geun Park; Choun-Ki Joo
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-14
Journal Detail:
Title:  Korean journal of ophthalmology : KJO     Volume:  26     ISSN:  1011-8942     ISO Abbreviation:  Korean J Ophthalmol     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-02-10     Completed Date:  2012-05-31     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  8804513     Medline TA:  Korean J Ophthalmol     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  6-9     Citation Subset:  IM    
Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
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MeSH Terms
Corneal Topography / methods*
Keratomileusis, Laser In Situ / methods*
Myopia / surgery*
Prospective Studies
Treatment Outcome

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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