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(Investigative Ophthalmology and Visual Science. 2004;45:1334-1339.)
© 2004 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.03-1025
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Corneal Healing after Uncomplicated LASIK and Its Relationship to Refractive Changes: A Six-Month Prospective Confocal Study

Avni Murat Avunduk, Carl Joseph Senft, Sherif Emerah, Emily D. Varnell, and Herbert E. Kaufman

From the Department of Ophthalmology, LSU Eye Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana.

PURPOSE. To investigate corneal healing and the factor(s) possibly responsible for refractive changes after laser in situ keratomileusis (LASIK).

METHODS. Twenty eyes of 10 patients who underwent LASIK for myopia were examined clinically and by real-time confocal microscopy for 6 months. Epithelial and posterior stromal thicknesses and the thickness of the keratocyte activation zone were measured, and refractive changes were compared with these values. Keratocyte morphology, flap thickness, and subbasal nerve fiber bundle morphology after LASIK were also investigated.

RESULTS. No significant change was detected over time in epithelial thickness after LASIK treatment; however, the posterior stromal thickness was found to be significantly higher 1 month after surgery. A slight but statistically significant negative correlation was detected between the thickness of the keratocyte activation zone and the spheroequivalent refraction after LASIK. The subbasal nerve fiber bundle’s morphology returned to its preoperative appearance 6 months after LASIK, but in the flap stroma the nerve fiber bundle morphology remained abnormal at 6 months after LASIK surgery.

CONCLUSIONS. A weak but significant negative correlation between the thickness of the keratocyte activation zone and spheroequivalent refraction was found after LASIK. The different refractive properties of activated keratocytes may be responsible for the myopic shift after LASIK. Further studies are needed to clarify this hypothesis.




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B. Sonigo, V. Iordanidou, D. Chong-Sit, F. Auclin, J. M. Ancel, A. Labbe, and C. Baudouin
In vivo corneal confocal microscopy comparison of intralase femtosecond laser and mechanical microkeratome for laser in situ keratomileusis.
Invest. Ophthalmol. Vis. Sci., July 1, 2006; 47(7): 2803 - 2811.
[Abstract] [Full Text] [PDF]


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