Journal of Otolaryngology and Ophthalmology of Shandong University ›› 2020, Vol. 34 ›› Issue (2): 17-21.doi: 10.6040/j.issn.1673-3770.1.2020.002

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Analysis of the advantages of flaps created with an optical coherence tomography-guided femtosecond laser

ZHANG Jing1,2, TAO Ye1, LI Fusheng1, WANG Shen1, QU Dongyi1, LI Ying3, ZHOU Yuehua1,2   

  1. 1. Beijing Vision Optometry, Beijing 100191, China;
    2. College of Ophthalmology, Chengdu University of Traditional Chinese Medicine, Chengdu 610075, Sichuan, China;
    3. Department of Ophthalmology, Chinese Academy of Medical Sciences / Peking Union Medical College Hospital, Beijing 100730, China
  • Published:2020-04-07

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Abstract: Objective To compare the features of corneal flaps created by using an optical coherence tomography(OCT)-guided femtosecond laser and those created by three other femtosecond lasers. Methods Four types of femtosecond laser laser-assisted in situ keratomileusis procedures were performed on 107 patients(200 eyes)with myopia and myopic astigmatism. Patients were divided into four groups of 50: group A, FEMTO LDV Z8 femtosecond laser; group B, Ziemer Crystalline femtosecond laser; group C, Wavelight FS200 femtosecond laser; and group D, Zeiss VisuMax femtosecond laser. Corneal flap thickness was measured and analyzed by RTVue OCT. Results At 1 week postoperatively, the corneal flap thickness in group A was close to the expected value and the variation range was small. The corneal flap thickness in group B was close to the expected value, but the variation range was large. The corneal flap thickness in group C was thin, that of group D was close to the expected value, and the variation ranges of both groups were small. The corneal flaps created by the four femtosecond lasers were regular and uniform in shape, and there was no statistically significant difference between central and peripheral thicknesses(P>0.05). The differences between the corneal flap thickness value and the predicted value of 110 μm among the four groups were obviously different. The results of groups A(3.43±2.81)μm and D(3.13±2.89)μm were obviously better than those of groups B(6.88±4.13)μm and C(5.44±3.62)μm(F=2.397; P=0.018). Conclusion Compared with the Ziemer Crystalline and Wavelight FS200 femtosecond lasers, the OCT-guided femtosecond laser and the Zeiss VisuMax femtosecond laser featured higher accuracy and better predictability.

Key words: Femtosecond laser, Flap thickness, Laser in situ keratomileusis, Optical coherence tomography

CLC Number: 

  • R772.2
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