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KMID : 0360220070480020245
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Journal of the Korean Ophthalmological Society
2007 Volume.48 No. 2 p.245 ~ p.250
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Comparison of Corneal Thickness Measured by Specular, US Pachymetry, and Orbscan in Post-PKP Eyes
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Kim Hyoung-Seok
Kim Jun-Heon
Kim Hyo-Myung
Song Jong-Suk
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Abstract
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Purpose: To compare the accuracy and reproducibility of central corneal thickness measured by non-contact specular microscopy, ultrasound pachymetry, and Orbscan in the post-penetrating keratoplasty eyes.
Methods: Central corneal thickness was prospectively measured in eyes that had recieved penetrating keratoplasty at least 1 month before. One experienced technician measured all eyes using three methods; non-contact specular microscopy (Topcon SP-2000P; Topcon Corporation, Tokyo, Japan), Orbscan IIz (Orbtek; Bausch & Lomb, Rochester, USA), and ultrasound pachymetry (AL-2000; Tomey, Erlangen, Germany). Three consecutive measurements were performed using each method and the mean values and coefficient of variation were compared.
Results: The mean values of central corneal thickness were 550.7±63.3 μm with specular microscopy, 548.2±72.5 μm with ultrasound pachymetry, and 472.5±151.7 μm with Orbscan. There was no significant difference between the measurements obtained by specular microscopy and ultrasound pachymetry (p=0.53), and both methods showed high reproducibility. The corneal thickness measured by Orbscan was remarkably variable and in some patients, Orbscan was unable to measure corneal thickness.
Conclusions: Non-contact specular microscopy appears to be an effective technique, potentially replacing ultrasound pachymetry for measuring central corneal thickness in the post-penetrating keratoplasty eyes. J Korean Ophthalmol Soc 48(2):245-250, 2007
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KEYWORD
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Corneal thickness, Keratoplasty, Orbscan, Pachymetry, Specular microscopy
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