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R.P. Stodtmeister; Corneal pachymetry by opitcal coherence tomography and by ultrasound. A comparison. . Invest. Ophthalmol. Vis. Sci. 2004;45(13):4494.
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Purpose: Central corneal thickness is a risk factor for glaucoma damage of the optic nerve head according to the results of the Ocular Hypertension Treatment Study. The most widely used method of measurement is ultrasound pachymetry. Its mean values in healthy caucasian subjects vary in published studies from 537µm to 578 µm. This variation may be attributed to differences in the examination techniques in spite built in algorithms of error detection. In this study we compare the results of ultrasound pachymetry with the results of pachymetry by optical coherence tomography. Methods: Ultrasound pachymetry was done by Pachette 500 (DGH Technology). The speed of sound was adjusted at 1640 m/sec. The probe was applied perpendicularly to the center of the cornea. One measurement was taken from each eye. All measurements were done by only one physician. Pachymetry by optical coherence tomography was done by the instrument of the 4optics company (Luebeck, Germany). The instrument allowed a measurement only when the measurement was done in the center of the cornea. One measurement was taken from each eye. The measurements were done by different staff members. The optical coherence measurement was done first. Results: The arithmetic means and the standard deviation and median (minimum; maximum) for optical coherence pachymetry (OCP) and for ultrasound (US) are given in the table.
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