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Journal of Biomedical Optics

Real-time pachymetry during photo-refractive keratectomy using optical low-coherence reflectometry
Author(s): Matthias Boehnke; Stefan Widmer; Rudolf Waelti
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Paper Abstract

Optical low-coherence reflectometry (OLCR) was used as a noncontact method to measure the central corneal thickness of three patients intraoperatively during photorefractive keratectomy. Continuous on-line measurements were performed on the intact cornea immediately before the beginning of surgery, after the removal of the corneal epithelium, during laser tissue photoablation, and for 3 min after the ablation process. Corneal thinning due to evaporation was studied on a separate patient with the OLCR instrument, and it was found to be ?0.14 µm/s during the first 5 min after epithelium removal. This baseline corneal thinning rate was used as a fit parameter to calculate actual from measured ablation depths. The measurements showed a maximum difference of ±10 µm between planned ablations (34–92 µm) and measured ablation depths.

Paper Details

Date Published: 1 October 2001
PDF: 6 pages
J. Biomed. Opt. 6(4) doi: 10.1117/1.1412438
Published in: Journal of Biomedical Optics Volume 6, Issue 4
Show Author Affiliations
Matthias Boehnke, Univ. of Bern (Switzerland)
Stefan Widmer, Univ. of Bern (Switzerland)
Rudolf Waelti, HAAG-STREIT AG (Switzerland)

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