Intraoperative optical pachymetry in photorefractive keratectomy

Journal of Cataract and Refractive Surgery
Mark D Mifflin, Xavier M Mortensen

Abstract

To study the effect of variables on the accuracy and reliability of the optical pachymeter built into the WaveLight EX500 excimer laser during photorefractive keratectomy (PRK). John A. Moran Eye Center, University of Utah, Salt Lake City, USA. Retrospective case series. A chart review of 352 eyes (181 patients) that had excimer laser PRK was performed. Programmed excimer laser residual stromal bed (RSB) measurements, optical pachymeter measurements after ablation, and Scheimpflug pachymetry measurements (Pentacam) at the 1-year follow-up were compared. Variables included ablation time, preoperative spherical equivalent (SE), 1-year SE, mitomycin-C use, operating room temperature and humidity, and programmed monovision. The mean programmed RSB was 27 μm greater than the optical pachymetry post-ablation measurement (P < .001). Of patients with a 1-year follow-up, the 1-year Scheimpflug pachymetry RSB was 24 μm greater than the optical pachymetry post-ablation RSB (P < .001). Comparison of the programmed RSB with the optical pachymetry post-ablation RSB showed that the preoperative SE and ablation time had a Pearson correlation coefficient of -0.36 and 0.30, respectively (P < .001). There was no correlation between operating room...Continue Reading

Associated Datasets

References

Apr 20, 2004·Journal of Cataract and Refractive Surgery·Keith A Walter, Aaron W Stevenson
Jun 15, 2006·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Sokpheaktra Sin, Trefford L Simpson
Apr 5, 2011·Investigative Ophthalmology & Visual Science·Aizhu TaoMohamed Abou Shousha
May 15, 2015·Journal of Refractive Surgery·Timothy A SoekenMatthew C Caldwell
May 26, 2015·Journal of Ophthalmic & Vision Research·Mohammad Mehdi SadoughiSepehr Feizi
Mar 12, 2016·Cornea·Michael MimouniIgor Kaiserman
Nov 18, 2016·Clinical Ophthalmology·Christopher T HoodShahzad I Mian
Sep 2, 2017·Clinical Ophthalmology·Mark D MifflinBrian Zaugg
Apr 7, 2018·Investigative Ophthalmology & Visual Science·Nauman HashmaniChoudhry M Saad

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