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Dr. Haya Al Farhan

Associate Professor

Associate Professor

كلية العلوم الطبية التطبيقية
225
publication
Journal Article
2012

Comparison of central corneal thickness measurements using ultrasound pachymetry, ultrasound biomicroscopy, and the Artemis-2 VHF scanner in normal eyes

WM., Al-Farhan HM1, Al-Otaibi . 2012

article

Purpose: To compare the precision of central corneal thickness (CCT) measurements taken with the handheld ultrasound pachymeter (USP), ultrasound biomicroscopy (UBM), and the Artemis-2 very high frequency ultrasound scanner (VHFUS) on normal subjects.
Design: Prospective study.
Methods: One eye from each of 61 normal subjects was randomly selected for this study. The measurements of the CCT were taken with the USP, VHFUS, and UBM. Results were compared statistically using repeated-measures analysis of variance (ANOVA), Pearson’s correlation coefficient, and limits of agreement.
Results: The average CCT (± standard deviation) was 530.1 ± 30.5 µm, 554.9 ± 31.7 µm, and 559.5 ± 30.7 µm for UBM, VHFUS, and USP respectively. The intraobserver repeatability analyses of variance are not significant for USP, UBM, and VHFUS. P-values were 0.17, 0.19, and 0.37 respectively. Repeated-measures ANOVA showed a significant difference between the three different methods of measuring CCT (P = 0.0001). The ANOVA test revealed no statistically significant difference between USP and VHFUS (P > 0.05), yet statistical significant differences with UBM versus USP and UBM versus VHFUS (P < 0.001). There were high correlations between the three instruments (P < 0.0001). The mean differences (and upper/lower limits of agreement) for CCT measurements were 29.4 ± 14.3 (2.7/56), 4.6 ± 8.6 (-14.7/23.8), and -24.8 ± 13.1 (-50.4/0.8) for USP versus UBM, USP versus VHFUS, and UBM versus VHFUS, respectively.
Conclusion: The UBM produces CCT measurements that vary significantly from those returned by the USP and the VHFUS, suggesting that the UBM may not be used interchangeably with either equipment for monitoring the CCT in the clinical setting.

Keywords: central corneal thickness, ultrasound pachymetry, ultrasound biomicroscopy, Artemis-2 VHFUS, Artemis, normal eyes

Publication Work Type
article
Volume Number
6
Magazine \ Newspaper
Clincal Ophthalmol
Pages
1037-43
more of publication
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Abstract

Purpose: To develop a Fourier method to assess wrinkling and other regular structure on the posterior capsule following cataract surgery

by C.C. Hull; H.M. Al–Farhan; R. Hameed; S.E. Horgan
2004
publications

Purpose:  Posterior capsular opacification (PCO) is the commonest complication of cataract surgery. The aim of this work is to develop a system that could be used by primary care practitioners to…

by H. Al-Farhan1, C. C. Hull1, R. Hameed2, S. E. Horgan2 and E. G. Woodward1
2002
publications

Purpose: To compare the precision of central corneal thickness (CCT) measurements taken with the handheld ultrasound pachymeter (USP), ultrasound biomicroscopy (UBM), and the Artemis-2 very high…

by Al-Farhan HM1, Al-Otaibi WM.
2012