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Abstract #48047 Published in IGR 13-4
Evaluation of parameters affecting measurement quality of dynamic contour tonometry
Gencer B; Gurlu VBalkan Medical Journal 2011; 28: 229-231
Objective: To evaluate factors affecting measurement quality of dynamic contour tonometry (DCT). Material and Methods: Three hundred patients took part in this prospective clinical study. For each patient, measurements for one eye were included in the study. Of the participants, 116 had ocular hypertension, 114 had glaucoma, and 70 had normal eyes. We used automatic refractokeratometry, ultrasonic pachimetry, Goldmann applanation tonometry, and DCT measurements to investigate the effects of age, corneal astigmatism, refractive error, central corneal thickness (CCT), intraocular pressures (IOP), and ocular pulse amplitude (OPA) on DCT measurement quality (Q). Logistic regression analysis was used for statistical analysis. Results: For 159 patients, the DCT Q score was 1 (group 1). For the remaining 141 patients, the Q score was 2-3 (group 2). The following values were determined for the two groups, respectively: mean age 58.9(plus or minus)9.9 and 61.4(plus or minus)10.6; mean corneal astigmatisms -0.78(plus or minus)0.67 and -0.92(plus or minus)0.77 diopter; mean spherical equivalents 0.33(plus or minus)1.87 and -0.01(plus or minus)2.02 diopter; mean CCT 547.0(plus or minus)35.2 and 549(plus or minus)38.7 (mu)m. Measurements with DCT provided mean IOPs of 18.5(plus or minus)3.70 and 21.27(plus or minus)6.19 mm Hg and mean OPA 3.5(plus or minus)1.4 and 3.2(plus or minus)1.2 mm Hg. By logistic regression analysis, we determined that the parameters affecting measurement quality were age, DCT measurement level, and OPA (p=0.015, p=0.000, and p=0.000, respectively). Conclusion: High IOP values, advanced age, and low OPA values can lead to decreased DCT measurement quality. (copyright) Trakya University Faculty of Medicine.
V. Gurlu. Department of Ophthalmology, Faculty of Medicine, Trakya University, Edirne, Turkey. Email: vuslatgurlu@trakya.edu.tr
Classification:
6.1.1 Devices, techniques (Part of: 6 Clinical examination methods > 6.1 Intraocular pressure measurement; factors affecting IOP)
