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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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.

According to the manufacturer 18 tonlmetry recent studies 1920 on cadaver eyes, DCT measurements are minimally dependent on structural properties of the cornea, particularly CCT. Scattergrams and linear regression were plotted for DCT, GAT, and PTGfor pressure values in the ranges 8 to 28, 8 to 38, and 8 to 58 mm Hg, respectively,in the hope of finding a linear correlation between corneal thickness andIOP values.

The corneal epithelium was tonnometry removed by manual abrasionwith a cotton swab and a blunt scalpel blade. Reproducibility and Clinical Evaluation of Rebound Tonometry. The transducer and the anterior chamber were kept at the sameheight.

Glaucoma Today – Dynamic Contour Tonometry (March/April )

Purchase this article with an account. Dynamic contour tonometry and GAT intraocular pressure differences significantly increased with older age slope, ttonometry.

Privacy Policy Terms of Use. Glaucoma Today is mailed bimonthly six times a year to 11, glaucoma specialists, general ophthalmologists, and clinical optometrists who treat patients with glaucoma. Corneal structure or biomechanics varies among patients even when CCT is the same. Correlation between central corneal thickness, applanation tonometry, and direct intracameral IOP readings. The ages ofthe cadavers ranged from 64 to 84 years. The Ocular Hypertension Treatment Study: In the present study, all patients with POAG had been receiving 1 or 2 vontour antiglaucoma eyedrops for months or years.


Many of these individuals are undergoing the tonomerty modification of their corneas via LASIK and other techniques. The theoretical foundations of dynamic contour tonometry.

Stamper may be reached at ; stamper itsa. In the low- and moderate-pressure range, inaccuracy of the GAT and the PTGwas not great and not likely to be of major clinical significance, but alsowas not linear.

PASCAL® Dynamic Contour Tonometer from Ziemer Group

RegeneRx Biopharmaceuticals announced the outcome of discussions between its U. Intraocular pressure measurements using dynamic contour tonometry after laser in-situ keratomileusis. Seven percent of patients were excluded from the analysis because of the inability to obtain good-quality DCT. This feature is available to authenticated users only. This is slightly longer than the contact time that an experienced examiner would require with the GAT.

The contour-matched contact surface 2 is located concentrically around the pressure sensor.

Invest Ophthalmol Vis Sci. Duba I, Wirthlin AC. Corneal thickness, corneal curvature, astigmatism, anterior chamber depth, and axial length were entered as continuous independent variables. Accurate measurement of intraocular pressure IOP is a fundamental parameter in any ophthalmic examination.

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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.


Excluded were patients with pseudoexfoliation, a history of trauma, pigmentary dispersion, narrow or closed iridocorneal angle, evidence of any secondary glaucoma, any type of preceding refractive surgery and corneal disease, and chronic or recurrent inflammatory eye disease eg, scleritis or dynamiic.

Dynamic contour tonometry: principle and use.

Kala Pharmaceuticals announced that it will be presenting at the Spotlight on dry eye session at the Ophthalmology Innovation Summit at the American Society of Cataract and Re…. The pressure sensor placed on the outside of the cornea thus measures a pressure that is equal to IOP.

Eyes with a history or evidence of previousintraocular surgery or corneal abnormalities were excluded. Relationship between corneal thickness and measured intraocular pressurein a general ophthalmology clinic.

In the subjects studied, IOP measurements with the DCT did not depend on corneal thickness, corneal curvature, or axial length.

Dynamic contour tonometry: principle and use.

The d equals the diameter of the contact area. Create an Account or Subscribe Now. Previous studies have shown IOP readings to decrease with successive GAT measurements, but this effect is absent in the case of rapid repetition of IOP measurements by the same examiner, as in the present study. Therefore, it is difficult to determine at what point to measure themanometric IOP: Purchase access Subscribe now.

No significant correlation could be found yonometry the real IOPand the degree of error of any of the tonometers. Central corneal thickness in low-tension glaucoma.