Objective To evaluate the short-term outcomes after femtosecond laser-assisted laser in situ keratomileusis (FEMTO-LASIK) in highly astigmatic myopes. Methods Eyes with more than 2.0 diopters (D) of astigmatism were identified from patient records. The mean preoperative cylinder was -2.45±0.62 DC in myopic eyes. Patients were examined preoperatively and 3 months postoperatively. Laser in situ keratomileusis was performed with a WaveLight FS200 femtosecond laser and a WaveLight eye-Qexcimer laser. Preoperative and postoperative refractions were converted to vector values. Induced torsion of the cylinder axis and the correction achieved for sphere and cylinder were determined. Data were analyzed using a paired t test and linear regression. Results After 3 months, the mean sphere was +0.37±0.50 D in myopic eyes and the mean cylinder was -0.57±0.44 D. Spherical equivalent(SE) correction was +0.18±0.48 D from the target value. Astigmatism was undercorrected by -0.30±0.43 D(t=6.17, P<0.01), and the mean induced torsion of the axis was 0.09±0.34 radians(t=2.22, P<0.05). Attempted and achieved SE corrections were highly correlated (R2=0.96). Conclusion Laser in situ keratomileusis in highly astigmatic eyes can precisely correct SE refraction but leads to astigmatic undercorrection. A slight counterclockwise torsion of the cylinder axis was induced.
米生健,李金科,段宇辉,陈蒙,贾丽. 飞秒激光制瓣LASIK矫正近视合并高度散光短期疗效观察[J]. 中华眼视光学与视觉科学杂志, 2014, 16(4): 221-223.
Mi Shengjian,Li Jinke,Duan Yuhui,Chen Meng,Jia Li. Short-term outcomes of femtosecond laser-assisted laser in situ keratomileusis for high astigmatism in myopes. Chinese Journal of Optometry Ophthalmology and Visual Science, 2014, 16(4): 221-223. DOI: 10.3760/cma.j.issn.1674-845X.2014.04.007
Kezirian GM, Stonecipher KG. Comparison of the IntraLase femtosecond laser and mechanical keratomes for laser in situ keratomileusis[J]. J Cataract Refract Surg,2004,30:804-811.
[4]
Chayet AS, Montes M, Gomez L, et al. Bitoric laser in situ keratomileusis for the correction of simple myopic and mixed astigmatism[J]. Ophthalmology,2001,108:303-308.
[5]
Lee VW. The LADAR6000: results in highly myopic and highly astigmatic eyes[J]. J Refract Surg,2006,22:S980-S982.
[6]
Kermani O, Schmeidt K, Oberheide U, et al. Hyperopic laser in situ keratomileusis with 5.5-, 6.5-, and 7.0-mm optical zones[J]. J Refract Surg,2005,21:52-58.
[7]
Lui MM, Silas MA, Apelbaum B, et al. Laser in situ keratomileusis with the Nidek EC-5000 excimer laser for astigmatism greater than 4.00 D[J]. J Refract Surg,2002,18:S321-S322.
[8]
Gamaly T. LASIK with the optimized aspheric transition zone and cross-cylinder technique for the treatment of astigmatism from 1.00 to 4.25 diopters[J]. J Refract Surg,2009,25:S927-S930.
[9]
Naeser K, Hjortdal J. Polar value analysis of refractive data[J]. J Cataract Refract Surg,2001,27:86-94.
[10]
Naeser K. Assessment and statistics of surgically induced astigmatism[J]. Acta Ophthalmol,2008,86 Suppl 1:5-28.
[11]
Bailey MD, Zadnik K. Outcomes of LASIK for myopia with FDA-approved lasers[J]. Cornea,2007,26:246-254.
[12]
Wolffsohn JS, Bhogal G, Shah S. Effect of uncorrected astigmatism on vision[J]. J Cataract Refract Surg,2011,37:454-460.
[13]
Ivarsen A, Naeser K, Hjortdal J. Laser in situ keratomileusis for high astigmatism in myopic and hyperopic eyes[J]. J Cataract Refract Surg,2013,39:74-80.