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Corneal stromal changes induced by myopic LASIK
M Vesaluoma1, J Pérez-Santonja, W M Petroll
1Department of Ophthalmology, Helsinki University Central Hospital, Finland. minna.vesaluoma@huch.fi
Investigative Ophthalmology & Visual Science
|February 12, 2000
Summary
Laser in situ keratomileusis (LASIK) for myopia correction causes thin flaps, microfolds, and interface particles. Keratocyte activation is short-lived, but thin flaps may correlate with increased interface reflectivity.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Laser Vision Correction
Background:
- Laser in situ keratomileusis (LASIK) is increasingly popular for myopia correction.
- Understanding the tissue responses to LASIK is crucial for patient outcomes.
Purpose of the Study:
- To characterize the morphologic changes in the human corneal stroma after myopic LASIK.
- To investigate tissue responses including flap thickness, keratocyte activation, and haze.
Main Methods:
- In vivo confocal microscopy was used to examine 62 myopic eyes post-LASIK.
- Measurements included flap thickness, keratocyte response zones, and haze grading.
- Examinations were conducted from 3 days to 2 years after surgery.
Main Results:
- Corneal flap interface particles and Bowman's layer microfolds were common findings.
- LASIK flaps were thinner than intended (112 +/- 25 microm vs. 160 microm).
- Keratocyte activation peaked at 3 days; interface reflectivity correlated with thinner flaps.
Conclusions:
- LASIK-induced keratocyte activation is transient compared to photorefractive keratectomy.
- Thin flaps, microfolds, and interface particles are frequent complications.
- Increased interface reflectivity and potential keratocyte loss in flaps may have clinical significance.