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S Radhakrishnan, Y Li, D Huang, V Westphal, R Shekhar, AM Rollins, JA Izatt; Optical Coherence Tomography Imaging of LASIK Flaps using 0.8 µm and 1.3 µm Wavelengths of Light - a Comparison Study . Invest. Ophthalmol. Vis. Sci. 2002;43(13):163.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To compare optical coherence tomographic (OCT) imaging of LASIK flaps using 0.8 µm and 1.3 µm wavelengths of light. Methods: 19 subjects who had undergone LASIK surgery were enrolled in the study. Corneal OCT scans were taken with an arc-scanning prototype operating at a wavelength of 0.8 µm and/or a high-speed OCT prototype at a wavelength of 1.3 µm. Three scans of the central cornea were taken preoperatively and 1 day and 1 week postoperatively. Images obtained with each system were analyzed for reflectivity characteristics of the LASIK flap. Results: LASIK flaps imaged with the real-time 1.3 µm OCT system showed increased internal reflectivity as well as higher interface reflectivity when compared with those imaged with the 0.8 µm system. The flap could be visualized in 100% of cases at first postoperative day with the 1.3 µm system, but only in 15-20% with the 0.8 µm system. The 1.3 µm wavelength also allows the use of higher power, which enables image acquisition with sufficient speed (0.12 sec) to eliminate most motion artifacts. Conclusion: 1.3 µm is the preferred wavelength for OCT imaging of the cornea
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