Publication: Laser in situ keratomileusis for high myopia using a small ablation zone and large aspheric transition zone
Issued Date
2004-09-01
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ISSN
1081597X
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2-s2.0-4644286303
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Refractive Surgery. Vol.20, No.5 SUPPL. (2004)
Suggested Citation
Anun Vongthongsri, Nutharin Phusitphoykai, Tulaya Tungsiriput Laser in situ keratomileusis for high myopia using a small ablation zone and large aspheric transition zone. Journal of Refractive Surgery. Vol.20, No.5 SUPPL. (2004). Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/21554
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Title
Laser in situ keratomileusis for high myopia using a small ablation zone and large aspheric transition zone
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Abstract
PURPOSE: To evaluate the efficacy and predictability of laser in situ keratomileusis (LASIK) using the Nidek NAVEX system with a small ablation (optical, OZ) zone and a large aspheric transition zone (OATz). METHODS: We report a prospective nonrandomized study of LASIK for high myopia using a small ablation in 23 eyes of 18 patients. The optical zone was between 3 and 3.8 mm and transition zone (TZ) was between 7 and 7.8 mm. Preoperative examination included best-spectacle corrected visual acuity (BSCVA), refraction, and corneal topography. All eyes were measured by the Nidek OPD-Scan and data were imported to FinalFit software. Aspheric profile (OATz) numbers 5 to 7 were used. BSCVA, uncorrected spectacle visual acuity (UCVA), refraction, and subjective evaluation of glare and night vision by questionnaire were recorded after surgery. RESULTS: At baseline, mean spherical equivalent refraction was -7.03 ± 2.39 D (range -5.50 to -15.50 D). Postoperative UCVA was better than 20/25 in 95.65% of eyes 3 months after LASIK Postoperative refraction was within ± 0.50 D of emmetropia in 91.3% of eyes and within ± 1.00 D in all eyes. No eye lost lines of BSCVA; 52.17% of eyes gained 1 line and 13.04% of eyes gained 2 lines. No patient reported significant glare or night vision problems on subjective questionnaire. CONCLUSION: LASIK with a small ablation (optical) zone and high aspheric transition zone using the Nidek NAVEX system was effective, predictable, and relatively safe for correction of high myopia.