PMID: 9423906Jan 10, 1998Paper

Corneal thickness measurements with the Orbscan Topography System and ultrasonic pachymetry

Journal of Cataract and Refractive Surgery
V YaylaliH W Thompson

Abstract

To compare corneal thickness measurements obtained with a new instrument, the Orbscan Topography System, with those obtained with the DGH ultrasonic pachymeter and to assess the agreement and repeatability of the two devices. LSU Eye Center, New Orleans, Louisiana, USA. Measurement agreement was assessed in 51 eyes of 26 normal volunteers using both Orbscan and ultrasonic pachymetry. Repeatability for the instruments was measured in 10 eyes of 5 additional volunteers. Corneal thicknesses were compared using the analysis of variance (ANOVA). The relationship between the devices was assessed by analysis of regression (ANOR). In the measurement agreement experiment, the mean corneal thickness was 571.3 microm +/- 6.21 SEM with the Orbscan system and 543.3 +/- 7.49 microm with ultrasonic pachymetry; these values were significantly different (F test, ANOVA, P = .0048). In the repeatability experiment, the mean thickness was 561.1 +/- 8.42 microm with the Orbscan system and 537.4 +/- 5.84 microm with ultrasound pachymetry; these values were also significantly different (F test, ANOVA, P = .0003). Analysis of regression showed a significant linear regression between the values obtained with the devices (P = .0001, F test, ANOR). In bo...Continue Reading

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Citations

Feb 16, 2006·Surgical and Radiologic Anatomy : SRA·Juan A Sanchis-GimenoFrancisco Martínez-Soriano
Feb 13, 2008·Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·C HerrmannG Duncker
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May 19, 2005·Journal of Cataract and Refractive Surgery·Gary R FishmanRobert Ritch
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