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Hand-held dynamic contour tonometry


Knecht, P B; Schmid, U; Romppainen, T; Hediger, A; Funk, J; Kanngiesser, H; Kniestedt, C (2011). Hand-held dynamic contour tonometry. Acta Ophthalmologica, 89(2):132-137.

Abstract

Purpose: We present a prototype of the hand-held dynamic contour tonometer (HH-DCT) and prospectively compare this HH-DCT with the well-established Perkins applanation tonometer (PAT) and the TonoPenXL (TPXL). Methods: In a prospective, single-centre, randomized study, intraocular pressure (IOP) readings were taken in random order using HH-DCT, PAT and TPXL tonometers. Intra-observer variability was calculated for each observer and compared between three experienced ophthalmologists and an inexperienced medical student. Results: Ninety-two corneas of 92 healthy participants were enrolled. IOP [mean mmHg +/- standard deviation (SD)] as measured by HH-DCT was 16.97 +/- 2.71, by PAT 13.98 +/- 2.52 and by TPXL 13.34 +/- 2.68. The range of three consecutive IOP readings differed significantly between the devices [p < 0.001; mean range: 1.45 +/- 1.07 (HH-DCT), 1.87 +/- 0.97 (PAT) and 2.08 +/- 1.77 (TPXL)]. There was no difference of the range in all devices between the ophthalmologists and the medical student (HH-DCT p = 0.68, PAT p = 0.54, TPXL p = 0.48). Conclusion: IOP readings measured by HH-DCT are significantly higher than by PAT and TPXL. The differences of IOP measurements are in good accordance with previous studies using the slit-lamp-mounted DCT (SL-DCT) and Goldmann Applanation Tonometry, where SL-DCT readings were 1-3.2 mmHg higher. HH-DCT seems to give more constant results, which can be seen in the lower intra-observer variability compared to PAT and TPXL.

Purpose: We present a prototype of the hand-held dynamic contour tonometer (HH-DCT) and prospectively compare this HH-DCT with the well-established Perkins applanation tonometer (PAT) and the TonoPenXL (TPXL). Methods: In a prospective, single-centre, randomized study, intraocular pressure (IOP) readings were taken in random order using HH-DCT, PAT and TPXL tonometers. Intra-observer variability was calculated for each observer and compared between three experienced ophthalmologists and an inexperienced medical student. Results: Ninety-two corneas of 92 healthy participants were enrolled. IOP [mean mmHg +/- standard deviation (SD)] as measured by HH-DCT was 16.97 +/- 2.71, by PAT 13.98 +/- 2.52 and by TPXL 13.34 +/- 2.68. The range of three consecutive IOP readings differed significantly between the devices [p < 0.001; mean range: 1.45 +/- 1.07 (HH-DCT), 1.87 +/- 0.97 (PAT) and 2.08 +/- 1.77 (TPXL)]. There was no difference of the range in all devices between the ophthalmologists and the medical student (HH-DCT p = 0.68, PAT p = 0.54, TPXL p = 0.48). Conclusion: IOP readings measured by HH-DCT are significantly higher than by PAT and TPXL. The differences of IOP measurements are in good accordance with previous studies using the slit-lamp-mounted DCT (SL-DCT) and Goldmann Applanation Tonometry, where SL-DCT readings were 1-3.2 mmHg higher. HH-DCT seems to give more constant results, which can be seen in the lower intra-observer variability compared to PAT and TPXL.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Ophthalmology Clinic
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2011
Deposited On:25 Nov 2009 09:00
Last Modified:05 Apr 2016 13:34
Publisher:Wiley-Blackwell
ISSN:1755-375X
Publisher DOI:10.1111/j.1755-3768.2009.01625.x
PubMed ID:19747220
Permanent URL: http://doi.org/10.5167/uzh-24429

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