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Proceedings Paper

Novel monitoring of corneal surface hydration during photorefractive keratectomy using pulsed photothermal radiometry: in-vitro study
Author(s): Satoko Kawauchi; Hiroko Matsuyama; Minoru Obara; Miya Ishihara; Tsunenori Arai; Makoto Kikuchi; Masayoshi Katoh
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Paper Abstract

We developed novel monitoring methodology for corneal surface hydration during photorefractive keratectomy (PRK) in order to solve undercorrection issue at the central part of cornea (Central island). We employed pulsed photothermal radiometry to monitor corneal surface hydration. We performed two experiments; gelatin gel experiments and porcine cornea experiments in vitro. In the case of the gelatin gel experiments, the e-folding decay time of transient infrared radiation waveform from the ArF laser irradiated surface was prolonged from 420 microsecond(s) to 30 ms with decreasing gelatin density from 15% to 0.15%. These measured e-folding decay times were good agreements with theoretical calculations. Using porcine cornea, we observed the e-folding decay time increase during the series of ArF excimer laser irradiations. Our method may be available to know ablation efficiency change to improve the controllability of refractive correction on the PRK.

Paper Details

Date Published: 26 May 1997
PDF: 5 pages
Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); doi: 10.1117/12.275111
Show Author Affiliations
Satoko Kawauchi, Keio Univ. (Japan)
Hiroko Matsuyama, Keio Univ. (Japan)
Minoru Obara, Keio Univ. (Japan)
Miya Ishihara, National Defense Medical College (Japan)
Tsunenori Arai, National Defense Medical College (Japan)
Makoto Kikuchi, National Defense Medical College (Japan)
Masayoshi Katoh, Hamamatsu Photonics KK (Japan)


Published in SPIE Proceedings Vol. 2971:
Ophthalmic Technologies VII
Pascal O. Rol; Karen Margaret Joos; Fabrice Manns, Editor(s)

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