Laser in situ keratomileusis for moderate and high astigmatism with VISX Star S3 excimer laser

Abstract

Objective To investigate the efficacy,predictability,and safety of laser in situ ker- atomileusis (LASIK) to correct moderate and high astigmatism with VISX Star S3. Methods We retrospec- tively studied 36 eyes of 25 patients who received primary LASIK using VISX Star S3 excimer laser, and the astigmatism of included eyes was at lest-2.00 diopters (D)and without flap complication. Follow-up was at least 6 months.Primary outcome measures included uncorrected visual acuity(UCVA), best spectacle-corrected visual acuity(BSCVA), manifest refraction, an assessment of astigmatic correction through vector analysis, andthe incidence of night glare.Results Preoperatively,the mean spherical component of refractiun was (-6.28± 3.05)D (range,±0.5 to-13.25D),the mean refractive cylinder was (-2.65±0.70)D (range,-2.0 to -4.25D). Postoperatively, 97.2% had an uncorrected visual acuity of 0.5 or greater, whereas 83.3 % demonstrated an un- corrected visual acuity of 1.0 or greater. 16.7% of eyes lost 1 line of best spectacle-corrected visual acuity, andno eyes lost greater than 1 line of BSCVA. The mean refractive cylinder was (0.46±0.44)D (range,0 to 1.25 D) with 58.3%±0.50 D and 94.4%±1.00 D of intended. Vector analysis showed that mean correction index (CI) was 0.98±0.18 with a mean angle of error of 3.30±3.8 degrees. 6/25 of patients suffered a lasted night glare at least one eye. Conclusins LASIK with the VISX Star S3 excimer laser is effective,reasouably pre- dictable, and safe for correction of moderate and high astigmatism, however, night glare of complains were not seldom. Key words: Astigmatism; Refractive corneal surgery; Eximer laser.