LASIK for high myopia: one year experience
Related Experiment Videos
Background And Objective:
Laser in situ keratomileusis (LASIK) is a technique combining the advantages of lamellar corneal surgery (not disturbing Bowman's layer) with the precision of excimer laser surgery. It can be used to correct myopia in a wide range of diopters. In this study we present our data on the first 34 consecutive cases of myopia correction by LASIK.
Patients And Methods:
Thirty four eyes of 27 patients with myopia ranging from -10.00 to -22.50 diopters (D) were operated with LASIK. The follow-up was from six months to one year. The mean age was 33.02 +/- 7.98 years, 32.4% were males and 67.6% were females. Surgery was always performed with the Chiron Automated corneal shaper resecting a corneal flap of 160 mu and then ablating the stromal bed (OZ 4.50 mm) with the Summit OmniMed 5.0 excimer laser. The parameters used to assess the results were predictability, safety (variation of spectacle corrected visual acuity), stability, and patient satisfaction.
Results:
Of the patients, 67.65% were between -1.00 and +1.00 at 6 months; 44.11% of eyes retained the same spectacle corrected visual acuity, 11.76% gained 1 line, 26.47% gained 2 lines, 8.82% lost 1 line and 8.82% lost 2 lines. Refraction at 1 month was 0.07 +/- 1.99 (range, -4.00 to +4.00); at 3 months 0.61 +/- 1.69 (range, -4.25 to +2.25); and at 6 months 0.81 +/- 1.71 (range, -4.75 to +2.25). Of the patients, 85.3% were happy with the procedure. Complications included two dislocated caps in the immediately post-operative period and two cases of epithelial ingrowth under the cap. Two eyes developed irregular astigmatism. These complications were found in the first two sessions of surgery and are related to the learning curve of the method.
Conclusion:
Results suggest that LASIK is a viable method for correction of high myopia with few complications and may have advantages over keratomileusis and PRK as it combines the best features of both methods--it preserves Bowman's layer and has the excimer laser precision. Refining the nomogram of ablation should result in even better results.