Topography-guided CATz Versus Conventional LASIK for Myopia With the NIDEK EC-5000: A Bilateral Eye Study

Farooqui, Mansoor A.; Al-Muammar, Abdul Rahman
October 2006
Journal of Refractive Surgery;Oct2006, Vol. 22 Issue 8, p741
Academic Journal
PURPOSE: To evaluate the difference in visual acuity, subjective night vision glare, and higher order aberrations in eyes with myopia with or without astigmatism operated with topography-guided customized corneal LASIK and conventional LASIK. METHODS: This contralateral study includes 46 eyes (23 patients) that underwent topography-guided corneal customized LASIK using the customized aspheric treatment zone (CATz) ablation profile in one eye and conventional LASIK using the NIDEK EC-5000 Advanced Vision Excimer laser system (NAVEX) in the other eye for myopia with or without astigmatism. Patients were masked to which eye underwent topography-guided CATz or conventional LASIK. Postoperative glare and root-mean-square (RMS) values for total higher order aberrations were measured at 1 and 3 months and compared between the two eyes. RESULTS: No significant difference was noted in uncorrected visual acuity between the two groups at 1 and 3 months postoperatively. Of all patients, 81% stated glare was higher in conventionally treated eyes than in the CATz-treated eyes at 1 and 3 months postoperatively. The RMS values for total coma (0.2385 vs 0.1522) and spherical aberration (0.2381 vs 0.1058) in conventionally treated and CATz-treated eyes were significantly higher in conventionally treated eyes (P=.029 and P=.004, respectively) at 3-month follow-up. CONCLUSIONS: Topography-guided corneal customized LASIK with the CATz profile gave better night vision quality as compared to conventional LASIK with expanded treatment zone. Better night vision quality was associated with less induced spherical aberrations and coma postoperatively in the CATz treatment group.


Related Articles

  • LASIK, corneal ring segments offer similar results. Guttman, Cheryl // Ophthalmology Times;5/1/2002, Vol. 27 Issue 9, p26 

    Comments on the applications of laser in situ keratomileusis (LASIK) and intrastromal corneal ring segments as valuable refractive surgery options for patients with low myopia and minimal astigmatism. Comparative study conducted on LASIK and corneal ring; Spherical equivalent results; Analysis...

  • Is it Time for Surgeons To Zap the Flap? Bethke, Walter // Review of Ophthalmology;Oct2002, Vol. 9 Issue 10, p140 

    Examines the use of Lasik enhancement technique in patients with minimal residual stroma. Technique of underside ablation of the flap; Decrease in myopia and astigmatism; Ablation rate of the flap.

  • Wavefront-guided LASIK scores high among myopic patients. Guttman, Cheryl // Ophthalmology Times;7/15/2003, Vol. 28 Issue 14, p24 

    Examines the use of wavefront-guided LASIK for the treatment of low-to-moderate myopia and myopic astigmatism. Value of the preoperative wavefront testing; Assessment of the efficacy of the procedure for improving visual function through contrast sensitivity testing and patient questionnaires;...

  • Wavefront-guided LASIK efficacious for myopic astigmatism. Guttman, Cheryl // Ophthalmology Times;7/15/2003, Vol. 28 Issue 14, p29 

    Examines the effectiveness of the wavefront-guided LASIK with the Allegretto Wave for correcting myopic astigmatism. Improvement in the quality of vision while reducing higher-order aberrations; Number of cases treated with the WaveLight system; Need of patients for aberration measurements to...

  • Vision quality measurably better with wavefront-guided LASIK. Guttman, Cheryl // Ophthalmology Times;7/15/2003, Vol. 28 Issue 14, p32 

    Focuses on the effectiveness of the CustomCornea wavefront-guided LASIK using the LADARWave aberrometer and the LADARVision 4000 excimer laser in the treatment of myopia and myopic astigmatism. Clinical trial results in eyes with hyperopia and mixed astigmatism; Visual acuity results to high...

  • Software innovation optimizes functional vision for myopics. Guttman, Cheryl // Ophthalmology Times;7/15/2003, Vol. 28 Issue 14, p36 

    Examines the treatment accuracy and the quantitative and qualitative vision outcomes in the use of LASIK data for myopic astigmatism using Nidek's NAVEX platform incorporating the Optimized Aspherical Transition Zone ablation algorithm. Reduction of postoperative night visions complaints;...

  • Intraoperative Optical Coherence Pachymetry During Laser in situ Keratomileusis--First Clinical Experience. Wirbelauer, Christopher; Duy Thoai Pham // Journal of Refractive Surgery;May2003, Vol. 19 Issue 3, p372 

    PURPOSE: To investigate intraoperative optical coherence pachymetry during laser in situ keratomileusis (LASIK). METHODS: In an initial clinical evaluation, three patients with myopia and myopic astigmatism were studied. Corneal thickness was assessed with optical pachymetry based on...

  • Comparison of Four Corneal Pachymetry Techniques in Corneal Refractive Surgery. Javaloy, Jaime; Vidal, Maria Teresa; Villada, Jose R.; Artola, Alberto; AliĆ³, Jorge L. // Journal of Refractive Surgery;Jan2004, Vol. 20 Issue 1, p29 

    PURPOSE: To assess the effectiveness of optical and ultrasonic pachymetry when examining corneas of patients before and after laser in situ keratomileusis (LASIK). METHODS: We conducted a prospective study of 25 patients (50 eyes) who had LASIK for myopia or myopic astigmatism (mean spherical...

  • Treatment uses asphericity. Pinelli, Roberto // Ophthalmology Times;11/1/2011, Vol. 36 Issue 21, p28 

    The article offers the insights of Roberto Pinelli, scientific director at Laser Ocular Microsurgery Institute in Brescia, Italy, regarding the new aspheric treatment for presbyopia called P-curve. According to Pinelli, the new solution will fix presbyopia symptoms without complaints and can be...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics