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Corneal higher order wavefront aberrations after hyperopic laser in situ keratomileusis
Atsuko Nanba1, Shiro Amano, Tetsuro Oshika
1Department of Ophthalmology, University of Tokyo School of Medicine, Tokyo, Japan.
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|February 24, 2005
Summary
Hyperopic laser in situ keratomileusis (LASIK) significantly increases corneal coma and spherical aberrations. This vision correction procedure alters the eye's optical quality, impacting visual outcomes.
Area of Science:
- Ophthalmology
- Optometry
- Corneal Surgery
Background:
- Laser in situ keratomileusis (LASIK) is a common refractive surgery.
- Hyperopic LASIK aims to correct farsightedness.
- Understanding post-operative optical changes is crucial for patient outcomes.
Purpose of the Study:
- To evaluate changes in corneal higher-order wavefront aberrations after hyperopic LASIK.
- To assess the impact of hyperopic LASIK on ocular aberrations.
Main Methods:
- Prospective case series of 15 eyes from 12 patients undergoing hyperopic LASIK.
- Corneal topography was performed pre- and post-surgery using a Nidek EC 5000 laser.
- Anterior corneal height data was used to calculate higher-order wavefront aberrations.
Main Results:
- Significant increases in corneal coma-like and spherical-like aberrations were observed post-surgery.
- Corneal spherical aberration polarity shifted from positive to negative.
- Changes in aberrations correlated with refractive outcomes, particularly for larger pupil sizes.
Conclusions:
- Hyperopic LASIK induces significant increases in corneal coma and spherical aberrations.
- The procedure alters the optical profile of the cornea, affecting visual quality.
- These changes are important considerations in refractive surgery outcomes.