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G. Unger, D. Sandner, D. Langner, T. Baier, M. Kohlhaas, L.E. Pillunat; Refractive Results After LASIK With Esiris Excimer Laser – Investigation of the Flap Thickness of 140 µm compared to 160 µm . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4394.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To avoid an iatrogene Keratectasie after LASIK the remaining thickness of the stroma has to be 250 µm. In cases that need higher corrections and have a primary smaller corneal thickness a thinner flap is desired to to keep more stroma for ablation. The possible influence of the thinner flap thickness for functionell and refractive results was investigated. Methods: During the period from 03/04 to 06/04 14 eyes of 7 patients (mean age of 32 years) was performed in LASIK with the Esiris Excimer Laser. The Amadeus microceratom was used to cut the flap. 0n the right eyes a flap thickness of 160µm were chosen on the partner eyes one of 140µm. The preoperative mean spherical equivalent was –5.35 D (SD ± 2,22 D; –8,25 D to –2,0 D) in the 140µm flap thickness group vs –4,94 D (SD ± –2,43 D; –8,75 D to –1.75 D) in the 160µm flap thickness group. All treatments were realized to same standards and were finished succesfully. Postoperative complications didn't occur. Results: With both flaps a slight undercorrection could be observed which stayed stable during follow–up. There was no significant difference between both groups (–0,63D vs –0,67D). In comparison, in 55% (vs 67%) visual acuity remained the same, in 18% (vs 17%) visual acuity improved by one line and in 27% (vs 17%) there was a reduction of best corrected visual acuity by one line in eyes treated with a 140µm (vs 160µm). 69% of the eyes in the 160 µm flap–group showed a uncorrected visual acuity of 0,8 or better vs 85% in the 140µm flap–group. Conclusions: There is no increase in complications while performing LASIK with a flap thickness of 140µm. Occurance of corneal striae was not observed more often with 140µm flaps. In tendency, the risk for a reduction in visual acuity is slightly lower with a flap thickness of 160µm, but the chance of an improvement in visual acuity and of reaching a best corrected visual acuity of 0,8 or better is higher with a flap thickness of 140µm.
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