Real-time pachymetry during photo-refractive keratectomy using optical low-coherence reflectometry

Matthias Boehnke; Stefan Widmer; Rudolf Waelti

doi:10.1117/1.1412438

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.

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Matthias Boehnke, Matthias Boehnke, Stefan Widmer, Stefan Widmer, Rudolf Waelti, Rudolf Waelti, } "Real-time pachymetry during photo-refractive keratectomy using optical low-coherence reflectometry," Journal of Biomedical Optics 6(4), (1 October 2001). https://doi.org/10.1117/1.1412438 . Submission:

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