gms | German Medical Science

22nd International Congress of German Ophthalmic Surgeons

18. to 21.06.2009, Nürnberg

Selective trefoil correction with Wavefront-guided LASIK

Meeting Abstract

  • Khristo Takhchidi - S.Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russia
  • Oleg Kostin - S. Fyodorov Eye Microsurgery Federal State Institution, Ekaterinburg, Russia
  • Alexander Doga - S.Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russia
  • Sergey Rebrikov - S. Fyodorov Eye Microsurgery Federal State Institution, Ekaterinburg, Russia
  • Alexander Ovchinnikov - S. Fyodorov Eye Microsurgery Federal State Institution, Ekaterinburg, Russia
  • Alexey Stepanov - S. Fyodorov Eye Microsurgery Federal State Institution, Ekaterinburg, Russia

22. Internationaler Kongress der Deutschen Ophthalmochirurgen. Nrnberg, 18.-21.06.2009. Dsseldorf: German Medical Science GMS Publishing House; 2009. Doc09docWK 5a.11

doi: 10.3205/09doc152, urn:nbn:de:0183-09doc1529

Published: July 9, 2009

© 2009 Takhchidi et al.
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Outline

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Purpose: To estimate trefoil changes using trefoil selective correction algorithm during Wavefront-guided LASIK for myopia and myopic astigmatism correction.

Patients and methods: 20 patients (40 eyes), Wavefront-guided LASIK with MEL-80. Before surgery and in 3 months post-op wavefront aberrations were measured in Malacara notation with WASCA, 6 mm pupil. Contrast sensitivity was measured with CSV-1000 (VECTORVISION). Group 1: 10 patients (20 eyes) – Wavefront-guided LASIK. Group 2: 10 patients (20 eyes) – Wavefront-guided LASIK with trefoil Z (3;3) selective correction. Corneal flap with 12 o’clock hinge was formed with Evolution 3E (Moria), M2 SU 90 heads.

Results: SE, groups 1 and 2 before surgery: -3.751,01 D and -4.30.95 D; after surgery: -0.020.08 D and 00.12 D, respectively (p>0.05). BCVA before surgery, Groups 1 and 2: 0.970.09 and 0.990.03; after surgery 1.010.12 and 0.990.02, respectively (p>0.05). RMS HO before surgery, Groups 1 and 2: 0.250.07 m and 0.230.07 m; after surgery 0.400.17 m and 0.410.07 m, respectively (p>0.05). Spheric aberration, Groups 1 and 2 before surgery: 0.120.19 m and -0.070.15 m; after surgery -0.390.30 m and -0.510.28 m, respectively (p>0.05). Trefoil value, both groups before surgery: -0.370.16 m, after surgery -0.380.24 m and -0.150.24 m, respectively (p<0.05). Contrast sensitivity values were significantly lower in Group 1 than in Group 2.

Conclusion: Wavefront-guided LASIK with trefoil Z(3;3) selective correction reduces trefoil value which provides higher contrast sensitivity values after surgery compared with Wavefront-guided LASIK.