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A Comparison Of Three Techniques Of Intraocular Pressure Measurements In Normal Eyes | 31237
ISSN: 2155-9570

Journal of Clinical & Experimental Ophthalmology
Open Access

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A comparison of three techniques of intraocular pressure measurements in normal eyes

5th International Conference on Clinical & Experimental Ophthalmology

Haya M Al Farhan and Maram Alblowi

ScientificTracks Abstracts: J Clin Exp Ophthalmol

DOI: 10.4172/2155-9570.S1.024


Purpose: To compare the precision of Intraocular Pressure (IOP) measurements taken with ORA, TRK-1P, and GAT in healthy eyes.
Design: Prospective study.
Methods: One eye of fifty seven normal subjects was randomly selected and included in this study. The measurements of the IOP
using ORA, TRK-1P, and GAT, and measurements CH, CRF, and CCT were taken with the ORA. Repeatability was assessed by
the Coefficient of Variation (CV) and Interclass Correlation Coefficients (ICC). Repeated-measures analysis of variance (ANOVA)
was used to test the statistical significance of the repeatability of three intra-observer readings. Agreement among tonometers was
assessed by Bland-Altman plots and the one way-ANOVA.
Results: The average of IOP for the IOPg, IOPcc, TRK-1P, and GAT (±SD) were 15.13±2.76, 14.39±2.59, 16.54±2.93, and 15.21±2.54
mmHg respectively. The intraobserver were higher for GAT and IOPg compare to TRK-1P. The intra observer for IOPg, TRK-1P,
and GAT (CV= 4.99, ICC=0.93), (CV=6.69, ICC=0.86), and (CV=4.22, ICC=0.94) respectively. The Repeated-measures analysis of
variance, P values for ORA, TRK-1P, and GAT were 0.13, 0.01, and 0.60 respectively. The results of the one way-ANOVA for the three
instruments was statistically significant (P= 0.01). The comparison pair test P values for GAT vs IOPg, GAT vs. 1OPcc were (p>0.05),
and GAT vs. TRK-1P, TRK-1P vs. 1OPg, and TRK-1P vs. IOPcc were (p<0.05).
Conclusion: GAT and IOPg were significantly more repeatable than TRK-1P. Both IOPg and IOPcc have good agreement with GAT
on normal subjects.


Haya M Al Farhan has completed her PhD from City University London, UK. She is an Associate Professor at King Saud University College of Applied Medicine Science.
She was the Head of Optometry and Visual Science department for 7 years at King Saud University, and at the present the Dean of Al-Mana College. She has published 12
papers in reputed journals and cited. She is also serving as an Editorial Board Member of Austin Ophthalmology Journal, and supervises postgraduate students for Master
and PhD degrees in joint with Salus University in USA.