CENTRAL CORNEAL THICKNESS MEASUREMENT WITH ORBSCAN 11 AND ULTRASOUND PACHYMETER

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HASHEMI H.; YAZDANI K.; MEHRAVARAN SH.; FOTOUHI A.

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Journal: JOURNAL OF CURRENT OPHTHALMOLOGY Year:2004 | Volume:17 | Issue:4 Page(s): 1-9

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Title

CENTRAL CORNEAL THICKNESS MEASUREMENT WITH ORBSCAN 11 AND ULTRASOUND PACHYMETER

Author(s)

HASHEMI H. | YAZDANI K. | MEHRAVARAN SH. | FOTOUHI A. | Issue Writer Certificate

Keywords

PACHYMETRYQ4

ORBSCANQ3

ULTRASOUNDQ4

RELIABILITYQ4

VALIDITYQ4

Abstract

Purpose: To compare central corneal thickness (GGT) readings measured by ORBSCAN II and Nidek ULTRASOUND Pachymeter (UP-1000) in healthy eyes and to evaluate the RELIABILITY coefficient of ORBSCAN II PACHYMETRY.Methods: In 88 eyes of 44 subjects GGT was measured twice by ORBSCAN II and then by ULTRASOUND. Sample rings of different diameters in the range of 0 mm to 3 mm were assigned to ORBSCAN II and measurements were recorded. before and after applying the manufacturer's suggested acoustic factor. A correction equation was calculated through regression analysis with which data were reanalyzed. To evaluate the relationship between the two devices, corneal thickness was compared using the 95% limits of agreement (LoA), The RELIABILITY coefficient of ORBSCAN II was assessed to determine the reproducibility of GGT measurements.Results: Mean CCT measured by ORBSCAN II and ULTRASOUND was 578 (range, 527-656) and 560 (range, 507-630) microns (m m) with standard deviations of 29 and 31, respectively. Mean difference between the two series of measurements was 18.7±15.5 mm and the 95% LoA was -11.7 to 49.2 mm. After applying the calculated correction equation, the mean difference changed to 0.38±15.4 mm (95% LoA: -29.9 to +30.7 mm).The RELIABILITY coefficients of ORBSCAN II in different diameters assigned were consistently high and was 0.978 (P<0.001) for the 2-mm-diameter ring.Conclusion: The two devices should not be used interchangeably before a precise correction equation is achieved through studies with samples of greater numbers and ranges of GGT. ORBSCAN II can be the single non-contact device used in follow-up of patients with intact corneas regarding its RELIABILITY.

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APA: Copy

HASHEMI, H., YAZDANI, K., MEHRAVARAN, SH., & FOTOUHI, A.. (2004). CENTRAL CORNEAL THICKNESS MEASUREMENT WITH ORBSCAN 11 AND ULTRASOUND PACHYMETER. JOURNAL OF CURRENT OPHTHALMOLOGY, 17(4), 1-9. SID. https://sid.ir/paper/53162/en

Vancouver: Copy

HASHEMI H., YAZDANI K., MEHRAVARAN SH., FOTOUHI A.. CENTRAL CORNEAL THICKNESS MEASUREMENT WITH ORBSCAN 11 AND ULTRASOUND PACHYMETER. JOURNAL OF CURRENT OPHTHALMOLOGY[Internet]. 2004;17(4):1-9. Available from: https://sid.ir/paper/53162/en

IEEE: Copy

H. HASHEMI, K. YAZDANI, SH. MEHRAVARAN, and A. FOTOUHI, “CENTRAL CORNEAL THICKNESS MEASUREMENT WITH ORBSCAN 11 AND ULTRASOUND PACHYMETER,” JOURNAL OF CURRENT OPHTHALMOLOGY, vol. 17, no. 4, pp. 1–9, 2004, [Online]. Available: https://sid.ir/paper/53162/en

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