LASIK ablation centration: an objective digitized assessment and comparison between two generations of an excimer laser

Journal of Refractive Surgery
A John Kanellopoulos, George Asimellis

Abstract

To objectively define the effective centration of myopic femtosecond laser-assisted LASIK ablation pattern, evaluate the difference between achieved versus planned excimer laser ablation centration, and compare these results from two different generations of an excimer laser system. The study retrospectively evaluated 280 eyes subjected to myopic LASIK. Digital image analysis was performed on Scheimpflug sagittal curvature maps (difference of preoperative to postoperative). Centration was assessed via proprietary software digital analysis of the coordinate displacement between the achieved ablation geometric center and the planned ablation center, which was the corneal vertex. Results from two different excimer laser generations (Eye-Q 400 [140 eyes] and EX500 [140 eyes]; Alcon/WaveLight, Fort Worth, TX) were compared. Radial displacement was on average 360 ± 220 µm (range: 0 to 1,030 µm) in the Eye-Q 400 laser group and 120 ± 110 µm (range: 0 to 580 µm) in the EX500 laser group (P < .01). The percentage of eyes with displacement of greater than 300 µm was 52% in the Eye-Q 400 laser group and 4% in the EX500 laser group. Displacement of ablation pattern may depend on the laser platform used. The improvement in the efficiency of...Continue Reading

References

Mar 20, 2001·Journal of Cataract and Refractive Surgery·M MrochenT Seiler
Aug 8, 2001·Journal of Cataract and Refractive Surgery·M MrochenW Hütz
Sep 1, 1962·Journal of Experimental Psychology·A E BARTZ
Jan 1, 2008·Journal of Cataract and Refractive Surgery·Hema ShankarKonrad Pesudovs
Mar 24, 2009·Journal of Cataract and Refractive Surgery·Prema PadmanabhanSubam Basuthkar
Apr 7, 2009·Ophthalmology·Kerry D SolomonUNKNOWN Joint LASIK Study Task Force
Apr 29, 2014·Journal of Cataract and Refractive Surgery·José Ramón Jimenez, Rosario González Anera

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Citations

Jul 13, 2018·Journal of Refractive Surgery·Gernot SteinwenderAndreas Wedrich
May 18, 2016·Asia-Pacific Journal of Ophthalmology·Angelique Pillar, Ronald Krueger
Apr 14, 2020·Clinical Ophthalmology·Karim Mahmoud Nabil
Jun 3, 2021·Journal of Cataract and Refractive Surgery·Filippos VingopoulosAnastasios John Kanellopoulos

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