Document Detail

Time course of corneal biomechanical parameters after laser in situ keratomileusis.
MedLine Citation:
PMID:  19641338     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To assess the time course of corneal biomechanics after laser in situ keratomileusis (LASIK). METHODS: We examined 36 eyes of 20 consecutive patients undergoing LASIK for low to moderate myopia. We quantitatively assessed the values of corneal biomechanics characterized by corneal hysteresis (CH) and corneal resistance factor (CRF) using an Ocular Response Analyzer (Reichert Ophthalmic Instruments) before and 1 week, 1, 3, and 6 months after surgery. We carried out this measurement 3 times, and the average value was used for statistical analysis. RESULTS: The CH was 10.6 +/- 1.7 (mean +/- SD) mm Hg preoperatively, and 8.6 +/- 1.2, 9.0 +/- 1.7, 9.0 +/- 1.4, and 8.9 +/- 1.5 mm Hg 1 week, 1, 3, and 6 months postoperatively, respectively. The CRF was 10.0 +/- 1.7 mm Hg preoperatively, and 7.3 +/- 1.5, 7.6 +/- 2.0, 7.8 +/- 1.6, and 7.7 +/- 1.6 mm Hg 1 week, 1, 3, and 6 months postoperatively, respectively. The variances of the data were statistically significant (p < 0.001 for both CH and CRF). Multiple comparisons demonstrated significant differences between measurements made before surgery and at all postoperative times (at 1 week and 1, 3, and 6 months; p < 0.001 for CH and CRF, Fisher's least significant difference test). CONCLUSIONS: Over the study period, the largest changes in corneal biomechanical parameters occurred within 1 week after surgery, and these then became nearly stable. No progressive deterioration of the corneal biomechanics was observed at any time during the 6-month follow-up period.
Kazutaka Kamiya; Kimiya Shimizu; Fumiko Ohmoto
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Publication Detail:
Type:  Journal Article     Date:  2009-07-29
Journal Detail:
Title:  Ophthalmic research     Volume:  42     ISSN:  1423-0259     ISO Abbreviation:  Ophthalmic Res.     Publication Date:  2009  
Date Detail:
Created Date:  2009-11-20     Completed Date:  2010-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0267442     Medline TA:  Ophthalmic Res     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  167-71     Citation Subset:  IM    
Department of Ophthalmology, University of Kitasato School of Medicine, Sagamihara, Kanagawa, Japan.
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MeSH Terms
Biomechanics / physiology
Cornea / physiopathology*,  surgery
Keratomileusis, Laser In Situ / adverse effects*
Middle Aged
Myopia / surgery
Postoperative Period
Time Factors

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