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Tsunenori Arai,Minoru Obara,Miya yoshikawa,Makoto Kikuchi,Satoko Kawauchi,Hiroko Matsuyama 慶熙大學校 레이저 工學硏究所 1996 레이저공학 Vol.7 No.-
We developed novel monitoring of corneal surface hydration during photorefractive keratectomy (PRK) in order to improve undercorrection of the central part of cornea (Central Island), which might be attributed to excessive hydration. We employed pulsed photothermal radiometry(PPTR), noncontact and noninvasive method to measure the absorption coefficient, to monitor corneal surface hydration. We performed two model experiments: gelatin gel experiments and porcine corneal in vitro experiments. In the case of the gelatin gel experiments, the absorption coefficient of the gelatin gel was changed by gelatin density. The e-folding decay time of transient infrared radiation waveform from the irradiated surface was prolonged with decreasing gelatin density. This measured e-folding decay time was good agreement with the result of theoretical calculations. Using porcine cornea, we observed the e-folding decay time extension during ArF excimer laser ablation of the porcine cornea. Our method may be available to improve the reproducibility in PRK.