Clin Exp Ophthalmol. Dec;34(9) Dynamic contour tonometry: principle and use. Punjabi OS(1), Kniestedt C, Stamper RL, Lin SC. The PASCAL Dynamic Contour Tonometer (DCT) from Ziemer is a slitlamp mounted tonometer for measuring intraocular pressure IOP independent of corneal. The gold standard for assessing IOP is Goldmann applanation tonometry (GAT). Recently, the dynamic contour tonometer (DCT) has become.

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Over the past four decades, Goldmann applanation tonometry GAT has become the standard for routine measurement of IOP, as the method has proven to be robust and easy to use with low intra- and interobserver variability. Intraocular pressure measurements using dynamic contour tonometry after laser in-situ keratomileusis.

One hundred fifty healthy volunteers from the hospital staff contoir normal eyes on slit lamp examination and no history of previous ocular diseases, trauma, or surgery contributed eyes that were evaluated in a prospective single-center study.

Nevertheless, it remains to be elucidated whether various topical glaucoma medications might confound the relationship between CCT and IOP.

With regard to increasing awareness of the effect of corneal thickness on IOP readings by GAT and the increasing number of patients with a history of corneal refractive surgery, DCT may offer some clinically relevant advantages over conventional Goldmann-type applanation tonometers for screening and management of patients with suspected or known glaucoma.

From Other Journals Object-based saccadic selection during scene perception: The advantage of an interocular or intraindividual comparison is minimal interference from other nonocular factors in different individuals. To test for significant differences between the ICCs, we calculated the sum of variance of all noise components for the two tests all variance components except the subjects variance component.


To determine whether elevated IOPs alter the corneal curvature and theaccuracy of DCT, 3 eyes were subjected to optical keratometry and cornealtopography Orbscan II at a maximal IOP of approximately 58 mm Hg after thelast trial series.

Coontour pressure measurements using dynamic contour tonometry after laser in situ keratomileusis. Invest Ophthalmol Vis Sci. Dynamic contour tonometry DCT and its dependence on corneal hydration in human cadaver eyes. Intraocular pressure readings by DCT were computed and displayed by the instrument, thereby reducing possible observer bias. For repeated measurements the intraobserver variability was 0.

Dynamic Contour Tonometry

Comparisons in pressure measurements were performed using the nonparametric Wilcoxon signed ranks test to account for the skewed and nonsymmetrical distribution of data points.

Therefore, it is difficult to determine at what point to measure themanometric IOP: Sign in to dyamic free article PDFs Sign in to access your subscriptions Sign in to your personal account. The bottle heights were increased in 5-cm increments up to a maximum of 75cm 58 mm Tonometryy. A piezoelectric sensor integrated into the contoured surface of the tip measures IOP without systematic errors caused by these forces or by changes in the corneal biomechanical properties. The use of cadaver eyes asthe model did not appear to affect the accuracy of DCT.

Eyes with a history or contlur of previousintraocular surgery or corneal abnormalities were excluded. Univariate linear regression using DCT as the dependent variable and GAT as the independent variable gives a slope of 0.

Unfortunately, these procedures render accurate IOP measurement by standard methods ie, applanation tonometry difficult or impossible. By continuing to use our website, you are agreeing to our privacy policy. Purchase this article with an account. Algebraic deviation from manometricintraocular pressure IOP.


PASCALĀ® Dynamic Contour Tonometer from Ziemer Group – Product Description and Details

This indicates parallelism between the 2 methods. Applanation tonometry is certainly knownto be influenced by corneal thickness. The results with Goldmann applanation tonometry were consistently below true IOP by an average of -4 mm Hg. Purchase access Subscribe to JN Learning for one year.

Glaucoma Today – Dynamic Contour Tonometry (March/April )

Privacy Policy Terms of Use. Applanation tonometry and correction according to corneal thickness. Create a free personal account to access your subscriptions, sign up for alerts, and more. Since a value is given automatically by the strain gauge andthe automatic software in the base station, there is less chance for observerbias with this system than with GAT. The cadaver eye holder wasmounted to the topography instrument and fixed in a way similar to that doneat the slitlamp for the IOP measurement trials.

For that reason, accurate IOP is a fundamental variable in clinical practice. Four eyes servedfor a preliminary study evaluating closed vs open stopcock systems, and theremaining 16 eyes were included in the main study and final analysis.

Ehlers N, Hansen FK. However, its accuracy dynmaic on many factors, including corneal thickness and other biomechanical properties.

Consentfor the use of the eyes was obtained by the eye banks either through premorteminstructions or from postmortem next of kin.