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Central Corneal Thickness Measurement by Ultrasound versus Orbscan II

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Author(s): Amir Faramarzi | Hossein Ziai

Journal: Journal of Ophthalmic & Vision Research
ISSN 2008-2010

Volume: 3;
Issue: 2;
Start page: 83;
Date: 2008;
Original page

ABSTRACT
PURPOSE: To compare Orbscan II and ultrasonic pachymetry for measurement of central corneal thickness (CCT) in eyes scheduled for keratorefractive surgery. METHODS: CCT was measured using Orbscan II (Bausch & Lomb, USA) and then by ultrasonic pachymetry (Tomey SP-3000, Tomey Ltd, Japan) in 100 eyes of 100 patients with no history of ocular surgery scheduled for excimer laser refractive surgery. RESULTS: Mean CCT was 544.7±35.5 (range 453-637) µm by ultrasonic pachymetry versus 546.9±41.6 (range 435-648) µm measured by Orbscan II applying an acoustic factor of 0.92 (P=0.14). The standard deviation of measurements was greater with Orbscan pachymetry but the difference was not statistically significant. CONCLUSION: CCT measurements by Orbscan II (applying an acoustic factor) and by ultrasonic pachymetry are not significantly different; however, when CCT readings by Orbscan II are in the lower range, it is advisable to recheck the measurements using ultrasonic pachymetry.
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