May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Lasik: Corneal Flap Thickness Planed vs. Measured With Confocal Microscopy by Using 3 Different Systems to Create the Flap
Author Affiliations & Notes
  • M. Ramirez, Sr.
    Cornea, Asoc para Evitar la Ceguera, Mexico City, Mexico
  • E. Hernandez-Quintela, Sr.
    Cornea, Asoc para Evitar la Ceguera, Mexico City, Mexico
  • R. Naranjo-Tackman, Sr.
    Cornea, Asoc para Evitar la Ceguera, Mexico City, Mexico
  • Footnotes
    Commercial Relationships  M. Ramirez, None; E. Hernandez-Quintela, None; R. Naranjo-Tackman, None.
  • Footnotes
    Support  Asociacio Para evitar la Ceguera en Mexico
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 2910. doi:https://doi.org/
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      M. Ramirez, Sr., E. Hernandez-Quintela, Sr., R. Naranjo-Tackman, Sr.; Lasik: Corneal Flap Thickness Planed vs. Measured With Confocal Microscopy by Using 3 Different Systems to Create the Flap. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2910. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To evaluate the difference between planed and measured corneal flap thickness after LASIK with three equipments to create the corneal flap.

Methods: : 90 eyes of 45 patients underwent LASK, corneal flaps were created by 3 different equipments: Group A: 30 eyes done by using the Hansatome microkeratome (Chiron Vision Corp, Claremont, Calif) to create a planed 160µm corneal flap, Group B: 30 eyes done by using the BD K-300 microkeratome (BD Ophthalmic Systems, Waltham, Mass) to create a planed 130 µm corneal flap, and group C: 30 eyes done by using the Femtosecond surgical laser (IntraLase Corp, Irvine, Calif) to create a planed 100 µm corneal flap. A Visx star 4 system (Visx, Santa Ana, CA, USA) was used to perform the laser ablation in all eyes. A central scan of the total corneal thickness was taken with the confocal microscope (Confoscan 4, Fortune Technologies, Italy) at 2 weeks after surgery. Corneal flap thickness was measured by using the NAVIS software V. 3.5.0 (NIDEK, Multi-Instrument Diagnostic System, Japan).

Results: : Measured mean flap thickness after LASIK at group A was thinner than planed (146.5 ± 20.3 µm P < 0.05). Measured mean flap thickness after LASIK at group B was not statistically significant different compared to planed (11.7 ± 12.9 µm P= 1.37). Measured mean flap thickness after LASIK at group C was thicker than planed (10.9 ± 13.8 µm P < 0.05)

Conclusions: : We found in only one of the three evaluated systems to create the corneal flap a not statistically significant difference between planed vs measured thickness but all of them showed more than 10 µm SD of measured thickness.

Clinical Trial: : www.clinicaltrials.gov NCT00558324

Keywords: refractive surgery: LASIK • cornea: stroma and keratocytes • laser 
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