Document Detail

Comparison of forward shift of posterior corneal surface after operation between LASIK and LASEK.
MedLine Citation:
PMID:  16374047     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To compare the forward shift of the posterior corneal surface as a function of time after surgery between successful laser in situ keratomileusis (LASIK) and laser-assisted subepithelial keratectomy (LASEK). METHODS: Twenty-two eyes from 14 patients who underwent LASIK and 19 eyes from 10 patients who underwent LASEK were reviewed retrospectively. The uncorrected visual acuity, spherical equivalent and pachymetry were obtained before and 1 or 2 weeks and 2, 6, 12, and 24 months after surgery. The change in the elevation of the posterior corneal surface was assessed using the difference map of an Orbscan II (Bausch and Lomb, Salt Lake City, Utah, USA), which was generated from the preoperative and subsequent postoperative elevation map. RESULTS: One or 2 weeks after LASIK and LASEK, the posterior corneal surface had shifted forward by 18.00 and 25.90 microm, respectively (p = 0.008). However, the mean posterior corneal surface reduced by 3.05 microm from 1 or 2 weeks to 2 years in the LASIK group (p = 0.359). In contrast, the mean posterior corneal surface had reduced by 12.40 microm in the LASEK group (p = 0.004). This forward shift did not return to the corneal normal elevation observed prior to surgery in the two groups. CONCLUSIONS: Refractive surgery induced a forward shift of the posterior corneal surface early postoperatively in the LASIK and LASEK groups, and this change after LASEK was significantly larger than that observed after LASIK. The posterior corneal surface gradually shifted backwards depending on the time course in both groups, but they did not return to the preoperative levels.
Hyojin Kim; Hyun Jin Kim; Choun-Ki Joo
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift für Augenheilkunde     Volume:  220     ISSN:  0030-3755     ISO Abbreviation:  Ophthalmologica     Publication Date:  2006  
Date Detail:
Created Date:  2005-12-23     Completed Date:  2006-03-02     Revised Date:  2007-09-17    
Medline Journal Info:
Nlm Unique ID:  0054655     Medline TA:  Ophthalmologica     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  37-42     Citation Subset:  IM    
Copyright Information:
2006 S. Karger AG, Basel
Department of Ophthalmology and Visual Science, College of Medicine, The Catholic University of Korea, Seoul, Korea.
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MeSH Terms
Cornea / pathology*,  surgery,  ultrasonography
Corneal Topography
Follow-Up Studies
Keratectomy, Subepithelial, Laser-Assisted*
Keratomileusis, Laser In Situ*
Myopia / surgery*
Postoperative Period
Retrospective Studies
Treatment Outcome

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

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