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.
| Author: | Nagis Kigajora |
| Country: | Niger |
| Language: | English (Spanish) |
| Genre: | Finance |
| Published (Last): | 12 October 2006 |
| Pages: | 429 |
| PDF File Size: | 14.78 Mb |
| ePub File Size: | 15.28 Mb |
| ISBN: | 972-9-65837-801-2 |
| Downloads: | 27263 |
| Price: | Free* [*Free Regsitration Required] |
| Uploader: | Shasar |
Corneal thickness, corneal curvature, astigmatism, anterior chamber depth, and axial length were entered as continuous independent variables. The examination technique with the DCT is similar to the technique used with the GAT, except that dynaamic does not require the sometimes cumbersome tuning of a knob to adjust two oscillating or melting semicircles, which leaves room for observer-dependent interpretation.
Forcing thecentral area of the cornea into the contour of the DCT tip allows the examinerto measure the pressure of the eye directly and continuously on the externalsurface of the cornea. The ages ofthe cadavers ranged from 64 to 84 years. Current Issue Archive Polls News.
The same investigators analyzed tonometer data obtained with DCT, Goldmann applanation tonometry, honometry pneumatonometry by plotting them against corneal thickness in healthy volunteers. Four eyes were used for the comparison of the open vs closed tubingsystems.
Get free access to newly published articles. Register for email alerts with links to free full-text articles Access PDFs of free articles Manage your interests Save searches and receive search alerts.
Statistical analysis was performed tono,etry computer SPSS statistical software, ver. Intraocular pressure readings by DCT were computed and displayed by the instrument, thereby reducing possible observer bias. 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.
After the experiment, the bottle height was lowered to theinitial 5 cm. Create a personal account to register for email alerts with links to free full-text articles. Therefore, patients with normal-tension glaucoma may have a higher IOP than measured. J Cataract Refract Surg. Intraocular pressure measurements using dynamic contour tonometry after laser in situ keratomileusis.
Comparison of Dynamic Contour Tonometry with Goldmann Applanation Tonometry | IOVS | ARVO Journals
We also thank Robin Troyer Tonomettry for her supportin the laboratory and for her coordination with the eye bank centers. Eyes with a history or evidence of previousintraocular surgery or corneal abnormalities were excluded. Proponents of the closed stopcock technique claim greateraccuracy. Intraocular pressure measured using DCT was consistently higher compared with GAT measurements in human cadaver eyes, 19 in eyes undergoing refractive surgery, 2528 and in healthy eyes.
Reproducibility and Clinical Evaluation of Rebound 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.
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.
Dynamic Contour Tonometry
Further studies are warranted todetermine its reliability in patients and the effect of corneal thickness. RegeneRx Biopharmaceuticals announced the outcome of discussions between its U.
Binocular motor coordination tonmetry saccades and fixations while reading: As a result, a force measurement can yield accurate IOP readings only if the mechanical properties of all eyes are always the same. Accuracy of Goldmann tonometry in clinical practice. Multiple stopcocks were also attachedto bleed all bubbles from the system and to allow either open or closed stopcocktechniques.
PASCAL® Dynamic Contour Tonometer from Ziemer Group
This site uses cookies. The device seems to be rynamic useful for IOP measurements in post-LASIK eyes as well as in other corneas that are thinner or thicker than average and in which the practitioner cannot achieve accurate readings by force tonometry.
Relationship between corneal thickness and measured intraocular pressure in a general ophthalmology clinic.
This feature is available to authenticated users only. Graefes Arch Clin Exp Ophthalmol. Dashed lines represent the natural shape of the cornea. The bottle heights were increased in 5-cm increments up to a maximum of 75cm 58 mm Hg.