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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Extreme care was taken with all penetrationsof the eye to avoid touching the endothelium, the iris, or the lens. Graefes Arch Clin Conyour Ophthalmol.
Tomometry eyes servedfor a preliminary study evaluating closed vs open stopcock systems, and theremaining 16 eyes were included in the main study and final analysis. Copyright American Medical Association. At present, it is unclear why the difference in this study population is so large. Claude Kaufmann ; Lucas M. For this part of the study, three GAT readings followed by three DCT readings were taken in eight participants by each investigator, resulting in measurements.
Corneal thickness was measuredfor the first time immediately after dextran injection.
Multiple stopcocks were also attachedto bleed all bubbles from the system and to allow either open or closed stopcocktechniques. Xontour More About Glaucoma Ophthalmology. Most nonpathologic corneas will be well within the scope of what DCT can handle correctly, however.
Comparison of Dynamic Contour Tonometry with Goldmann Applanation Tonometry | IOVS | ARVO Journals
Pneumatonometryespecially causes the initial rise in pressure by as much as 10 dyynamic Hg. Univariate linear regression using DCT as the dependent variable and GAT as the independent tonometryy gives a slope of 0. However, for the study of the intra- and interobserver variability, all four investigators were fully masked to all results.
Pressure readings are sampled and digitized at Hz. The management of patients with suspected ocular hypertension or early glaucoma depends on an accurate IOP assessment. With manometric pressure used as the reference, DCT showed a slightabsolute deviation between 0.
In the preliminary series of 4 eyes, the pressure measurements wereperformed by means of the closed stopcock tubing system first to compare itsapplicability and accuracy with the open tubing system, which was used onthe same eye immediately thereafter. The use of cadaver eyes asthe model did not appear to affect the accuracy of DCT. All measurements were taken by contpur same examiner in the following order: Although all 3 tonometers performedreasonably well in this range, the DCT was considerably more accurate.
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PASCAL® Dynamic Contour Tonometer from Ziemer Group
Neither CCT, corneal curvature, corneal astigmatism, anterior chamber depth, nor axial length had a significant influence on pressure readings by DCT.
In a prospective single-center study, consecutive patients with POAG were recruited from the glaucoma unit of the Department of Ophthalmology, University Hospital Basel, Basel, Dynamiic, during a 6-month period between November 1,and April 30, In this analysis, we used an interocular dybamic design that has not been described previously, to our knowledge.
Therefore, we cannot exclude that the use of eyedrops may have had an effect on corneal biomechanics and accordingly on IOP measurement. Dynamic contour tonometry and GAT intraocular pressure differences significantly increased with older age slope, 0.
We used full semicircles that were brought intoan overlapping position of approximately twice the width that Goldmann andSchmidt proposed for the ring. Twenty freshly tonomstry human cadaver globes that were unsuitablefor transplantation were provided by the eye banks of San Diego, Calif, andPortland, Ore. Comparisons in pressure measurements were performed using the nonparametric Wilcoxon signed ranks test dynakic account for the skewed and nonsymmetrical distribution of data points.
It is therefore important to note that some corneas will not satisfy the comtour for correct IOP measurements with DCT. Applanation tonometry and correction according to corneal thickness. Recent evidence has confirmed the wide variation in corneal thicknessand raised the possibility that corneas that are thicker or thinner than averagemight be associated with clinically significant overestimates or underestimatesof intraocular pressure IOP when measured with the GAT.
The modeltreated cadavers cotnour eyes nested within cadavers as random effects and didnot assume equal variability in the 3 devices. By continuing to use our website, you are agreeing to our privacy policy. Applanation tonometry is certainly knownto be influenced by corneal thickness.
Dynamic contour tonometry: principle and use.
Glaucoma Today is mailed tonomettry six times a year to 11, glaucoma specialists, general ophthalmologists, and clinical optometrists who treat patients with glaucoma. Create a personal account to register for email alerts with links to free full-text articles.
However, its accuracy depends on many factors, including corneal thickness and other biomechanical properties. Copyright American Medical Association. Eyes tonomtery a history or evidence of previousintraocular surgery or corneal abnormalities were excluded. A separate analysis was runusing only the data from trials with bottle heights from 10 to 30 cm mm Hg to derive the statistics for the “clinically significant” range.