Dynamic Contour Tonometry and Goldman Applanation Tonometry in Eyes With Keratoconus

Barreto, Jackson; Babić, Mirko; Vessani, Roberto Murad; Susanna, Remo

doi:10.1590/s1807-59322006000600004

Cited by 14 publications

(19 citation statements)

References 11 publications

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“…16 For better comparability with our study, we reanalyzed their data separating keratoconus and postkeratoplasty eyes and performed Kendall rank correlation analysis between corneal parameters and IOP measures of both tonometers.…”

Section: Methodsmentioning

confidence: 99%

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Dynamic Contour Tonometry in Keratoconus and Postkeratoplasty Eyes

Meyenberg

Iliev²,

Eschmann³

et al. 2008

Cornea

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Section: Methodsmentioning

confidence: 99%

“…14 In a clinical study with 10 postkeratoplasty eyes, DCT was favored as well. 15 On the other hand, Barreto et al 16 suspected both tonometers to be similarly dependent on corneal biomechanical abnormalities in keratoconus eyes.…”

mentioning

confidence: 99%

Dynamic Contour Tonometry in Keratoconus and Postkeratoplasty Eyes

Meyenberg

Iliev²,

Eschmann³

et al. 2008

Cornea

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“…30 In eyes with keratoconus, the difference between DCT and GAT ranged from 4.3 to 5.3 mmHg. 20,32,67 Pascal tonometry seems to be largely independent of the IOP and CCT in those patients. 32 In eyes that had undergone keratoplasty and refractive surgery, DCT seems to be less influenced by changes in corneal properties following these procedures.…”

Section: Dynamic Contour Tonometry -Pascal Tonometer (Smt Swiss Micromentioning

confidence: 92%

“…15,16,66 It is a useful tool in situations where the clinician suspects inaccurate IOP measurements that could be caused by corneal biomechanical properties. It is particularly accurate in eyes with keratoconus, 20,21,67 corneal edema, 68 and those that have undergone penetrating keratoplasty 21,22,69 and refractive surgery. 25,70 The DCT provides a score (Q) representing the quality of the IOP measure.…”

Section: Dynamic Contour Tonometry -Pascal Tonometer (Smt Swiss Micromentioning

confidence: 99%

Modalities of Tonometry and their Accuracy with Respect to Corneal Thickness and Irregularities

Moraes

Prata

Liebmann

et al. 2008

Journal of Optometry

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Recent advances in tonometry have led to the development of a number of devices with differing clinical applications. Their role in cases of abnormal corneal thickness and surface irregularities is particularly important, as inaccurate estimation of the true intraocular pressure (IOP) in such cases may lead to suboptimal evaluation. The purpose of the present review was to evaluate the accuracy of the most widely used devices in cases of corneal thickness and surface irregularities, based on a survey of the published literature. The analysis was based on a Medline search focusing mainly on papers that have evaluated the devices' accuracy with respect to corneal thickness and irregularities. Nine device types (Goldmann tonometer, Tono-Pen, Perkins tonometer, Ocular Response Analyzer, non-contact tonometer, pneumatonometer, I-Care rebound tonometer, Pascal dynamic contour tonometer (DCT) and Phosphene tonometer) were described in detail. Moreover, the physical principles and major utility of each tonometer were compared. Each of the many different commercially available tonometers has specific advantages and disadvantages. New non-invasive technologies are getting closer to a precise estimation of the true IOP. However, among all tonometers, none is highly accurate when both corneal thickness and surface irregularities are present. Fifty years after its development, Goldmann tonometry remains the gold standard to which all other devices are compared. RESUMENAvances recientes en el campo de la tonometría han propiciado el desarrollo de diversos dispositivos con diferentes aplicaciones clíni-cas. Resulta de particular importancia el papel que juegan en el caso de espesores corneales anormales o en presencia de irregularidades en la superficie de la córnea, puesto que, en esos casos, una medida imprecisa de la presión intraocular (PIO) real puede traer como consecuencia una valoración incorrecta del caso. El objetivo de esta revisión es evaluar el grado de precisión de los dispositivos más utilizados hoy en día en casos en los que existen irregularidades en la superficie de la córnea o en el espesor corneal. Para ello, se llevó a cabo una búsqueda de datos entre los artículos publicados. El análisis estuvo basado en una búsqueda bibliográfica realizada dentro de Medline, centrándose principalmente en aquellos artícu-los científicos que habían estudiado el grado de precisión del dispositivo en función del espesor corneal del paciente y de la presencia o no de irregularidades corneales. Se describen en detalle nueve tipos de dispositivos: tonómetro de Goldmann, Tono-Pen, tonómetro de Perkins, Ocular Response Analyzer, tonómetro sin contacto, neumotonómetro, tonómetro de rebote I-Care, tonómetro de contorno dinámico Pascal y tonómetro de fosfeno. Además, se presentan de forma comparada los principios físicos en los que está basado cada tonómetro y las situaciones en las que cada uno resulta de mayor utilidad. Cada uno de los distintos tonómetros disponibles en el mercado presenta ventajas y desventajas respecto...

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“…Consequently, some ophthalmologists use only the measurements with Q2 and Q1 in their research and publications to avoid excessive variability [10][11][12]. The aim of our study was to assess if IOP and OPA measurements with Q3 were comparable to values obtained with Q2 and Q1 and if the former were acceptable for clinical and research purposes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the quality score of intraocular pressure and ocular pulse amplitude values measured by the Pascal dynamic contour tonometer

2008

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The Pascal dynamic contour tonometer (PDCT) is designed to measure intraocular pressure (IOP) largely independent of the corneal properties. It is equipped with a digital LCD screen that displays the IOP, the ocular pulse amplitude (OPA) and the quality score (Q) of the measurements [range 1 (excellent) to 5 (poor)]. The manufacturer has recommended discarding the IOP and OPA values of Q4 and Q5. The aim of our study was to assess if IOP and OPA measurements with Q3 are acceptable for clinical and research purposes. This is a prospective, observational study in which both patients with ocular hypertension or glaucoma and healthy subjects were enrolled; three consecutive PDCT IOP measurements were performed on all participants. Only patients and subjects with Q1, Q2 and Q3 recorded together were eligible. Only one eye per subject was considered for statistical analysis. The mean PDCT IOP and OPA were taken for statistical analyses. An ANOVA test for repeated measures was used to compare the differences between PDCT IOP and OPA Q1, Q2, and Q3 scores. A total of 87 subjects met the inclusion criteria. Mean PDCT (+/-SD) IOP were 17.5 +/- 3.4 mmHg for Q1, 17.6 +/- 3.3 mmHg for Q2 and 17.9 +/- 3.3 mmHg for Q3 (P > 0.05). Mean OPA Q1, Q2 and Q3 were 2.5 +/- 0.9, 2.5 +/- 1.0 and 2.5 +/- 1.0 mmHg, respectively, and were not statistically different. Based on these results, we concluded that the IOP and OPA values with Q1, Q2 or Q3 measured by PDCT are not significantly different and can therefore be taken into account indiscriminately for clinical and research purposes.

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Dynamic Contour Tonometry and Goldman Applanation Tonometry in Eyes With Keratoconus

Cited by 14 publications

References 11 publications

Dynamic Contour Tonometry in Keratoconus and Postkeratoplasty Eyes

Dynamic Contour Tonometry in Keratoconus and Postkeratoplasty Eyes

Modalities of Tonometry and their Accuracy with Respect to Corneal Thickness and Irregularities

Comparison of the quality score of intraocular pressure and ocular pulse amplitude values measured by the Pascal dynamic contour tonometer

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