Clinical trial NCT00558324: Corneal Flap Thickness Planed vs Measured After LASIK by Using Tree Different Systems Cut
Official title: Corneal Flap Thickness Planed vs Measured After LASIK by Using Tree Different Systems Cut
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: NA
Conditions: Refractive Errors
Keywords: LASIK
Confocal microscopy
Flap
Lead sponsor: Asociación para Evitar la Ceguera en México
Sponsor class: OTHER
Collaborators: name: Universidad Nacional Autonoma de Mexico
First posted: 2007-11-14
Enrollment: 43
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Primary purpose: SCREENING

Brief summary: Determine the flap thickness created by femtosecond laser or a mechanical microkeratome using in vivo confocal microscopy and compare measured versus intended flap thickness.

Detailed description: Eighty-six eyes had undergone LASIK were examined, al within 2 weeks to 1 month after surgery. Study involved 3 treatment groups: One with 30 eyes of 15 patients, corneal flaps were created with the microkeratome femtosecond laser 15 KHz 100μm (Intralase Corp, Irvine, Calif.), one with 30 eyes of 15 patients, corneal flaps were created with mechanical microkeratome (Hansatome 160μm (Chiron Vision Corp, Claremont, Calif) and one with 26 eyes of 13 patients, corneal flaps were created with mechanical microkeratome K3000 130μm ( BD Ophthalmic Systems, Waltham, Mass) . A central scan of the total corneal thickness was taken with the confocal microscope (Confoscan 4, Fortune Technologies, Italy) before and at 2 weeks and 1 month after surgery. Corneal epithelial thickness and the Anterior stroma morphology were analyzed by using the NAVIS software V. 3.5.0 (NIDEK, Multi-Instrument Diagnostic System, Japan).

Eligibility criteria: Inclusion Criteria:

* Patients ask for LASIK surgery
* Patients with stable refraction in the last year
* Patients without systemic and ocular disease
* Patients with 500 microns in pachymetry
* Normal topography

Exclusion Criteria:

* Patients cannot attend their appointments
* Residual, recurrent or active ocular disease
* Previous ocular surgery except LASIK
* Autoimmune or connective tissue disease
* Pregnancy

Primary outcomes:
measure: Measured thickness flap using Confocal microscopy study
timeFrame: 14 days after LASIK
Secondary outcomes:
Other outcomes:
Locations:
city: México city
country: Mexico
facility: Asociación Para Evitar la Ceguera en Mëxico, Hospital "Luis Sánchez Bulnes".
state: Distrito Federal
Study officials:
affiliation: Asociación para Evitar la Ceguera
name: Ramírez F. Manuel, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Asociación para Evitar la Ceguera
name: Ramírez G. Laura, MD
role: STUDY_CHAIR
References:
citation: Huhtala A, Pietila J, Makinen P, Suominen S, Seppanen M, Uusitalo H. Corneal flap thickness with the Moria M2 single-use head 90 microkeratome. Acta Ophthalmol Scand. 2007 Jun;85(4):401-6. doi: 10.1111/j.1600-0420.2006.00838.x.
citation: Sarayba MA, Ignacio TS, Binder PS, Tran DB. Comparative study of stromal bed quality by using mechanical, IntraLase femtosecond laser 15- and 30-kHz microkeratomes. Cornea. 2007 May;26(4):446-51. doi: 10.1097/ICO.0b013e318033e7cc.
citation: Hoffmann S, Krummenauer F, Tehrani M, Dick HB. Impact of head advance and oscillation rate on the flap parameter: a comparison of two microkeratomes. Graefes Arch Clin Exp Ophthalmol. 2003 Feb;241(2):149-53. doi: 10.1007/s00417-002-0599-z. Epub 2003 Jan 28.
citation: Belin MW, Schultze RL. Microkeratomes. Int Ophthalmol Clin. 2000 Summer;40(3):57-65. doi: 10.1097/00004397-200007000-00008. No abstract available.
citation: Eisner RA, Binder PS. Technique for measuring laser in situ keratomileusis flap thickness using the IntraLase laser. J Cataract Refract Surg. 2006 Apr;32(4):556-8. doi: 10.1016/j.jcrs.2006.01.003.
citation: Durrie DS, Kezirian GM. Femtosecond laser versus mechanical keratome flaps in wavefront-guided laser in situ keratomileusis: prospective contralateral eye study. J Cataract Refract Surg. 2005 Jan;31(1):120-6. doi: 10.1016/j.jcrs.2004.09.046.
citation: Solomon KD, Donnenfeld E, Sandoval HP, Al Sarraf O, Kasper TJ, Holzer MP, Slate EH, Vroman DT; Flap Thickness Study Group. Flap thickness accuracy: comparison of 6 microkeratome models. J Cataract Refract Surg. 2004 May;30(5):964-77. doi: 10.1016/j.jcrs.2004.01.023.
citation: Ismail MM. LASIK using the NIDEK EC-5000 for the correction of hyperopic astigmatism. J Refract Surg. 2006 Nov;22(9 Suppl):S1069-72. doi: 10.3928/1081-597X-20061102-11.
citation: Dougherty PJ. The thin-flap LASIK technique. J Refract Surg. 2005 Sep-Oct;21(5 Suppl):S650-4. doi: 10.3928/1081-597X-20050902-19.
citation: Montes-Mico R, Rodriguez-Galietero A, Alio JL. Femtosecond laser versus mechanical keratome LASIK for myopia. Ophthalmology. 2007 Jan;114(1):62-8. doi: 10.1016/j.ophtha.2006.07.019. Epub 2006 Oct 27.
citation: Ramirez M, Hernandez-Quintela E, Naranjo-Tackman R. A comparative confocal microscopy analysis after LASIK with the IntraLase femtosecond laser vs Hansatome microkeratome. J Refract Surg. 2007 Mar;23(3):305-7. doi: 10.3928/1081-597X-20070301-15.
citation: Ramirez M, Hernandez-Quintela E, Sanchez-Huerta V, Naranjo-Tackman R. Confocal microscopy of corneal flap microfolds after LASIK. J Refract Surg. 2006 Feb;22(2):155-8. doi: 10.3928/1081-597X-20060201-13.