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Aspheric laser in situ keratomileusis for the correction of myopia using the technolas 217z100: Comparison of outcomes versus results from the conventional technique

  • Akihito Igarashi
  • Kazutaka Kamiya
  • Mari Komatsu
  • Kimiya Shimizu
Clinical Investigation

Abstract

Purpose

To compare postoperative outcomes of a new aspheric laser in situ keratomileusis (LASIK) system, which applies an index for corneal asphericity (Q-value), with outcomes of the conventional LASIK procedure.

Methods

Twenty-eight eyes of 15 consecutive patients (mean age, 36.4 ± 5.8 years) underwent aspheric LASIK (As-LASIK group), and 33 eyes of 18 consecutive patients (mean age, 32.9 ± 8.3 years) underwent conventional LASIK (Con-LASIK group) at Sanno Hospital (Tokyo, Japan). Both procedures were performed with a Moria LSK-One microkeratome and a Bausch and Lomb Technolas 217-z100 excimer laser. Preoperative mean spherical equivalent refraction values were −5.13 ± 1.23 diopters (D) and −5.63 ± 0.88 D in the As-LASIK and Con-LASIK groups, respectively. Higher order aberrations were measured and contrast sensitivity was assessed at 3 months after the procedure, and these, along with safety, efficacy, and predictability, were compared between the two procedures.

Results

Conventional LASIK significantly increased higher order aberrations and reduced contrast sensitivity, whereas As-LASIK did not increase spherical-like aberrations or alter contrast sensitivity.

Conclusions

Aspheric LASIK may be a better laser technique than Con-LASIK, with less postoperative increase in spherical-like aberrations and better control over contrast sensitivity.

Keywords

algorithm asphericity LASIK quality of vision Q-value 

References

  1. 1.
    Pallikaris IG, Papatzanaki ME, Stathi EZ, Frenschock O, Georgiadis A. Laser in situ keratomileusis. Lasers Surg Med 1990;10:463–468.CrossRefPubMedGoogle Scholar
  2. 2.
    Pallikaris IG, Siganos DS. Excimer laser in situ keratomileusis and photorefractive keratectomy for correction of high myopia. J Refract Cornea Surg 1994;10:498–510.Google Scholar
  3. 3.
    Kremer FB, Dufec M. Excimer laser in situ keratomileusis. J Refract Surg 1995;11:244–247.Google Scholar
  4. 4.
    Perez-Santonja JJ, Bellot J, Claramonte P, Ismail MM, Alio JL. Laser in situ keratomileusis to correct high myopia. J Cataract Refract Surg 1997;23:372–385.PubMedGoogle Scholar
  5. 5.
    Shaikh NM, Manche EE. Laser in situ keratomileusis for myopia and compound myopic astigmatism using the Technolas 217 scanning-spot laser. J Cataract Refract Surg. 2002;28:485–490.CrossRefPubMedGoogle Scholar
  6. 6.
    Aizawa D, Shimizu K, Komatsu M, et al. Clinical outcome of wavefront guided laser in situ keratomileusis: 6-month follow-up. J Cataract Refract Surg 2003;29:1507–1513.CrossRefPubMedGoogle Scholar
  7. 7.
    Kohnen T, Buhren J, Kuhne C, Mirshahi A. Wavefront-guided LASIK with the Zyoptix 3.1 system for the correction of myopia and compound myopia astigmatism with 1-year follow-up. Ophthalmology 2004;111:2175–2185.CrossRefPubMedGoogle Scholar
  8. 8.
    Kymionis GD, Tsiklis Ns, Astyrakakis N, Pallikalis AI, Panagopoulou SI, Pallikalis IG. Eleven-year follow-up of laser in situ keratomileusis. J Cataract Refract Surg 2007;33:191–196.CrossRefPubMedGoogle Scholar
  9. 9.
    Oshika T, Miyata K, Tokunaga T, et al. Higher order wavefront aberrations of cornea and magnitude of refractive correction in laser in situ keratomileusis. Ophthalmology 2002;109:1154–1158.CrossRefPubMedGoogle Scholar
  10. 10.
    Zhou C, Jin M, Wang X, Ren Q. Corneal wavefront-guided ablation with the Schwind ESIRIS laser for myopia. J Refract Surg 2007;23:573–580.PubMedGoogle Scholar
  11. 11.
    Seiler T, Reckmann W, Maloney RK. Effective spherical aberration of the cornea as a quantitative descriptor in cornea topography. J Cataract Refract Surg 1993;19:155–165.PubMedGoogle Scholar
  12. 12.
    Applegate RA, Howland HC, Sharp RP, Cottingham AJ, Yee RW. Corneal aberrations and visual performance after radial keratotomy. J Refract Surg 1998;14:397–407.PubMedGoogle Scholar
  13. 13.
    Dupps WJ, Roberts C. Effect of acute biomechanical changes on cornea curvature after photokeratectomy. J Refract Surg 1998;24:1007–1009.Google Scholar
  14. 14.
    Koller T, Iseli HP, Hafezi F, Mrochen M, Seiler T. Q-factor customized ablation profile for the correction of myopic astigmatism. J Cataract Refract Surg 2006;32:584–589.CrossRefPubMedGoogle Scholar
  15. 15.
    Hori-Komai Y, Toda I, Asano-Kato N, Ito M, Yamamoto T, Tsubota K. Comparison of LASIK Using the NIDEK EC-5000 Optimized Aspheric Transition Zone (OATz) and conventional ablation profile. J Refract Surg 2006;22:546–556.PubMedGoogle Scholar
  16. 16.
    Mrochen M, Krueger RR, Bueeler M, Seiler T. Aberration-sensing and wavefront-guided laser in situ keratomileusis: management of decentered ablation. J Refract Surg 2002;18:418–429.PubMedGoogle Scholar
  17. 17.
    Alio JL, Montes-Mico R. Wavefront-guided versus standard LASIK enhancement for residual refractive errors. Ophthalmology 2006;113:191–197.CrossRefPubMedGoogle Scholar

Copyright information

© Japanese Ophthalmological Society (JOS) 2009

Authors and Affiliations

  • Akihito Igarashi
    • 1
    • 3
  • Kazutaka Kamiya
    • 1
  • Mari Komatsu
    • 2
  • Kimiya Shimizu
    • 1
  1. 1.Department of OphthalmologyKitasato University School of MedicineSagamiharaJapan
  2. 2.Sanno HospitalTokyoJapan
  3. 3.Department of OphthalmologyKitasato University School of MedicineKanagawaJapan

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