| Minor influence of myopic laser in situ keratomileusis on the posterior corneal surface. | |
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MedLine Citation:
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PMID: 19387069 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To check whether myopic LASIK induces changes on the posterior corneal surface. METHODS: A Scheimpflug system (Pentacam; Oculus, GmbH, Wetzlar, Germany) was used to measure preoperative and postoperative posterior corneal topography in 27 eyes (of 14 subjects) that had undergone standard myopic LASIK surgery (attempted corrections between -1.25 and -8.50 D) and on 18 nonoperated eyes (9 subjects). A hybrid porcine-plastic eye model was developed to validate the measurement technique. Longitudinal displacement of the posterior corneal apex and changes of the apical radius of curvature and asphericity were computed. RESULTS: Measurements on a hybrid model eye of known posterior corneal geometry showed that the measured posterior corneal radius of curvature was minimally affected by the geometry of the anterior surface. The measurements on patients showed that, on average, the only relevant (though clinically unimportant) change in radius of curvature and asphericity occurred the first day after surgery (DeltaR = -28 +/- 34 microm and DeltaQ = -0.06 +/- 0.06). No statistically significant change was observed afterward. The change in radius was more pronounced in the vertical direction than in the horizontal direction. On average, there was no significant displacement of the posterior corneal apex. Individual changes over time did not show a systematic trend across patients, and control subjects experienced changes of the same order of magnitude. CONCLUSIONS: The Pentacam Scheimpflug system can be used reliably to assess changes in the posterior corneal radius of curvature after LASIK. There is no evidence of surgically induced changes in the corneal posterior surface beyond 1 week after surgery. |
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Authors:
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Alfonso Pérez-Escudero; Carlos Dorronsoro; Lucie Sawides; Laura Remón; Jesús Merayo-Lloves; Susana Marcos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies Date: 2009-04-22 |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: 50 ISSN: 1552-5783 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-08-28 Completed Date: 2009-09-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: United States |
Other Details:
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Languages: eng Pagination: 4146-54 Citation Subset: IM |
Affiliation:
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Instituto de Optica, Daza de Valdés, Consejo Superior de Investigaciones Científicas, Madrid, Spain. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Animals Corneal Topography Diagnostic Techniques, Ophthalmological / instrumentation* Endothelium, Corneal / pathology* Humans Keratomileusis, Laser In Situ* Lasers, Excimer / therapeutic use* Middle Aged Models, Anatomic Myopia / surgery* Photography / methods* Postoperative Period Preoperative Care Reproducibility of Results Surgical Flaps Swine Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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