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Expanded range customcornea algorithms for myopia and astigmatism: one-month results
Francesco Carones1, Luca Vigo, Elena Scandola
1Carones Ophthalmology Center, Milan, Italy. fcarones@carones.com
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|November 5, 2004
Summary
This study shows that an updated algorithm for wavefront-guided LASIK effectively improves vision for higher refractive errors. While most patients experienced good outcomes, a small number had increased high-order aberrations, which will be addressed in future adjustments.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Wavefront Aberrometry
Background:
- Laser in situ keratomileusis (LASIK) is a common refractive surgery.
- Wavefront-guided ablation offers customized correction for refractive errors.
- Optimizing algorithms is crucial for expanding treatment ranges and improving outcomes.
Purpose of the Study:
- To assess the early clinical results of an adjusted wavefront-guided customized ablation algorithm.
- To evaluate the efficacy of the LADARVision4000 system with an expanded correction range.
- To analyze visual acuity, refractive error, and aberrations after LASIK.
Main Methods:
- Fifty-five myopic and astigmatic eyes underwent LASIK using the LADARVision4000 system.
- Spherical equivalent errors ranged from +0.30 to -8.13 D; astigmatism from 0 to -3.75 D.
- Standard visual measurements and wavefront aberrometry were performed pre- and post-operatively (up to 6 months).
Main Results:
- Mean manifest spherical equivalent was -0.18 D one month post-LASIK.
- 78% of eyes achieved 20/20 or better uncorrected visual acuity (UCVA).
- Best spectacle-corrected visual acuity (BSCVA) improved significantly, with 89% achieving 20/16 or better.
Conclusions:
- The optimized algorithm is effective for improving BSCVA in higher refractive errors.
- A minority of patients showed a slight increase in high-order aberrations.
- Future nomogram adjustments will address minor spherical equivalent undercorrection.