Dynamic Contour Tonometry

Kanngiesser, Hartmut; Kniestedt, Christoph; Robert, Y.

doi:10.1097/01.ijg.0000176936.16015.4e

Cited by 202 publications

(59 citation statements)

References 31 publications

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“…DCT, which is based on the principle of contour matching, has been proposed as an alternative method for measuring IOP that is supposed to be less influenced by corneal properties [13]. Although GAT has been considered the gold standard for measuring the IOP, a few studies performed on cadaver eyes have reported that IOP measurements with DCT were closer to the true manometric IOP than those obtained with the GAT [15,16].…”

Section: Discussionmentioning

confidence: 99%

“…The tip creates a tight-fitting shell with the cornea when in contact with it, and compensates for all forces exerted on it. Several studies have reported that IOP measurement with the DCT is not affected by CCT [13,17,22]. By contrast, GAT and Perkins tonometry have been reported to paradoxically underestimate IOP in eyes with corneal edema in both in vitro and in vivo studies [18,20,23,24].…”

Section: Introductionmentioning

confidence: 96%

“…In addition, it has been reported that the mean CCT of eyes with ocular hypertension were significantly greater than those with glaucoma or normal control eyes [7,11]. However, dynamic contour tonometry (DCT), which is a novel nonapplanation contact tonometry, is supposed to measure IOP largely independent of CCT and corneal curvature [13]. The tip creates a tight-fitting shell with the cornea when in contact with it, and compensates for all forces exerted on it.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of contact lens-induced corneal edema on Goldmann applanation tonometry and dynamic contour tonometry

Yoo

Kim

et al. 2008

Graefes Arch Clin Exp Ophthalmol

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of contact lens-induced corneal edema on Goldmann applanation tonometry and dynamic contour tonometry

Yoo

Kim

et al. 2008

Graefes Arch Clin Exp Ophthalmol

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“…16 DCT was designed to be largely independent of structural properties of the cornea and to eliminate most of the systematic errors arising from physiological variables of the eye, which render GAT less accurate. 17 Some recent studies compared the performance of the new device against other tonometers [18][19][20][21][22] considering either the influence of pachymetry on IOP readings [23][24][25][26] or the impact of refractive surgery as a source of errors in applanation tonometry. [27][28][29][30] Only two studies evaluated ocular structural factors other than pachymetry influencing IOP measurements in healthy subjects 31 or African American subjects.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Goldmann applanation tonometry and dynamic contour tonometry in healthy and glaucomatous eyes

Ceruti

Morbio

Marraffa

et al. 2008

Eye

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Purpose To compare the measurements of intraocular pressure (IOP) with dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) in healthy and glaucomatous eyes and to evaluate the influence of corneal thickness (CCT), corneal curvature (CC), axial length (AL), and age on these tonometric alternatives. Methods Three hundred eyes of 100 healthy subjects, 100 patients with primary open angle glaucoma, and 100 patients with primary angle-closure glaucoma underwent IOP evaluation with DCT and GAT, and measurements of CCT, CC, and AL. Bland-Altman plots were used to evaluate the agreement between tonometers. Regression analysis was used to evaluate the influence of ocular structural factors on IOP measurements obtained with both tonometers. Results Bland-Altman plots indicated that the 95% limits of agreement between tonometers were À1.4 to 6.6 mmHg. DCT values measured 2.6 ± 1.9 mmHg higher than GAT readings (Po0.001). The mean IOP difference between DCT and GAT (DIOP) was higher in healthy than in glaucomatous eyes and the magnitude of difference increased with increasing CCT. A significant reduction of DIOP with an increase in both CCT (Po0.001) and IOP values (Po0.001) was found. Regression analysis showed no effect of CC, AL, and age on both DCT and GAT readings. In contrast to GAT (Po0.001), DCT measurements were not influenced by CCT (P ¼ 0.43).Conclusions IOP readings obtained by DCT were higher and less affected by CCT than those by GAT. The DIOP was higher in healthy than in glaucomatous eyes and decreased in relation to increased CCT and IOP values.

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“…Recently, the new dynamic contour tonometry (DCT), based on the principle of contour matching and on the law of hydrostatic pressure by Blaise Pascal (1623–1662), was introduced. It was described in more detail by Kannigiesser et al[ 17]. It is a slit-lamp-mounted, self-calibrating, and battery-operated device.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Goldmann Applanation Tonometry and Dynamic Contour Tonometry in the Measurement of Intraocular Pressure in Eyes with Different Corneal Thicknesses

Roszkowska¹,

Grazia²,

Cirone³

et al. 2009

Ophthalmologica

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Purpose: To compare Goldmann applanation tonometry (GAT) and dynamic contour tonometry (DCT) in the evaluation of intraocular pressure (IOP) in eyes with different corneal thicknesses. Methods: GAT and DCT were performed in 70 eyes of 35 subjects aged between 21 and 59 years. Thirty eyes had normal, nonoperated corneas and 40 eyes had reduced central corneal thickness (CCT) following myopic photorefractive keratectomy. The GAT and DCT values were correlated to CCT and age and the agreement between both tonometers was determined by the Bland and Altman method. Results: GAT correlated strongly with CCT (p = 0.0002), but there was no correlation between DCT and CCT (p = 0.4388). No correlation was found between IOP values obtained with both devices and age. The Bland and Altman plot evidenced a lack of agreement between both tonometers with 95% limits of agreement between 1.6 and –5.6 mm Hg. Conclusions: GAT gives significantly lower values in the eyes with thin corneas and DCT is not influenced by CCT. DCT could be recommended to evaluate IOP in eyes with out-of-range corneal thickness.

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Dynamic Contour Tonometry

Cited by 202 publications

References 31 publications

The effect of contact lens-induced corneal edema on Goldmann applanation tonometry and dynamic contour tonometry

The effect of contact lens-induced corneal edema on Goldmann applanation tonometry and dynamic contour tonometry

Comparison of Goldmann applanation tonometry and dynamic contour tonometry in healthy and glaucomatous eyes

Comparison of Goldmann Applanation Tonometry and Dynamic Contour Tonometry in the Measurement of Intraocular Pressure in Eyes with Different Corneal Thicknesses

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