Results 171 to 180 of about 20,194 (207)

Intraocular Pressure Values Obtained by Ocular Response Analyzer, Dynamic Contour Tonometry, and Goldmann Tonometry in Keratokonic Corneas

Journal of Glaucoma, 2010
To determine the agreement between dynamic contour tonometer (DCT), Goldmann applanation tonometer (GAT), and Ocular Response Analyzer (ORA) in keratoconic corneas and to find out the effect of corneal biomechanics on intraocular pressure (IOP) measurements obtained by these devices.IOP was measured with the ORA, DCT, and GAT in random order in 120 ...
Gokhan Ozge, Atilla Bayer, Afsun Sahin, Volkan Hurmeric   +3 more
openaire   +3 more sources

Ocular Tonometry Through Sonic Excitation and Laser Doppler Velocimetry

Journal of Biomechanical Engineering, 1979
Glaucoma is an insidious eye disease which must be detected in its early stages for there to be successful treatment. Primary detection of glaucoma and evaluation of therapy have depended upon tonometric methods which require applanation of the cornea. A new method of IOP determination which is noncontacting and nonapplanating has been devised.
J. M. Hamelink, Gary Cloud
openaire   +2 more sources

Measurement of Intraocular Pressure with Goldmann Applanation Tonometry, Dynamic-Contour Tonometry, and Ocular Response Analyzer

2016
Intraocular pressure (IOP) is an eye parameter of fundamental importance for the diagnosis of several eye conditions. The clinical standard for IOP measurement is Goldmann applanation tonometry (GAT), which has been the basis for the studies that determined current glaucoma management. Nevertheless, GAT is endowed with a number of limitations, so newer
P. Fogagnolo, M. Digiuni, L. Rossetti
openaire   +2 more sources

Effect of Central Corneal Thickness and Corneal Hysteresis on Tonometry as Measured by Dynamic Contour Tonometry, Ocular Response Analyzer, and Goldmann Tonometry in Glaucomatous Eyes

Journal of Glaucoma, 2008
The dynamic contour tonometer (DCT; Pascal tonometer) and the Ocular Response Analyzer (ORA) are novel tonometers designed to measure intraocular pressure (IOP) independent of corneal properties and central corneal thickness (CCT), respectively. We wanted to compare the corneal compensated IOP (IOPcc) as measured by ORA with IOP values measured by DCT ...
Annette, Hager, Hager, Annette, Kristina, Loge, Loge, Kristina, Bernd, Schroeder, Schroeder, Bernd, Mark-Oliver, Füllhas, Füllhas, Mark-Oliver, Wolfgang, Wiegand, Wiegand, Wolfgang   +9 more
openaire   +2 more sources

Evaluation and Testing of Novel Ocular Tactile Tonometry Device

2014
This article describes the experimental analysis of a novel trans-scleral tonometer based on the use of multiple force sensors forming a mechanical stiffness sensor. This approach is similar to an instrumented form of digital palpation tonometry in which manual palpation is used to conclude the stiffness, and hence, the intraocular pressure of the eye.
Eniko T. Enikov, Péter P. Polyvás, R. Jančo, M. Madarász   +3 more
openaire   +2 more sources

Development of a Non-Invasive Calibration Method for Ocular Tactile Tonometry

Volume 3A: Biomedical and Biotechnology Engineering, 2013
This article describes a novel method of indirect estimation of intra-ocular pressure using tactile sensors. Two sensor calibration methods have been demonstrated: an artificial neural network (ANN) model and a phenomenological reduced-parameter model based on finite element analysis. The ANN method showed superior performance with an accuracy of +/− 0.
Eniko T. Enikov, Péter P. Polyvás
openaire   +2 more sources

Comparison of dynamic contour tonometry and Goldmann applanation tonometry and their relationship to corneal properties, refractive error, and ocular pulse amplitude

Optometry - Journal of the American Optometric Association, 2009
Accurate intraocular pressure (IOP) measurement is essential in diagnosing and managing glaucoma. Dynamic contour tonometry (DCT) is less dependent on corneal properties, such as thickness, elasticity, and rigidity, than Goldmann applanation tonometry (GAT).
Michael Rollins, Chad Anderson, Amber Belaustegui, Dina H. Erickson, Denise Goodwin   +4 more
openaire   +3 more sources

Evaluation of Goldmann Applanation Tonometry Using a Nonlinear Finite Element Ocular Model

Annals of Biomedical Engineering, 2006
Goldmann applanation tonometry (GAT) is the internationally accepted standard for intra-ocular pressure (IOP) measurement, which is important for the diagnosis of glaucoma. The technique does not consider the effect of the natural variation in the corneal thickness, curvature and material properties. As these parameters affect the structural resistance
Elsheikh, Ahmed, Wang, Defu, Kotecha, Aachal, Brown, Michael, Garway-Heath, David   +4 more
openaire   +4 more sources

Intraocular pressure decrease after local ocular cooling is underestimated by applanation tonometry

International Ophthalmology, 1995
The effects of intense systemic or local cooling on aqueous humor dynamics in animals are an increased total outflow facility and a decreased aqueous flow. Few studies suggest that only vasoconstriction of arteriolar segments of the episcleral vasculature may be the cause for a decrease in intraocular pressure after local cooling in humans.
Phillip Hendrickson, Josef Flammer, Daniela Stümpfig, Selim Orgül   +3 more
openaire   +3 more sources

Comparison of rebound and applanation tonometry in the management of patients treated for glaucoma or ocular hypertension

Ophthalmic and Physiological Optics, 2008
AbstractAim:  To compare intraocular pressure (IOP) values obtained with the iCare rebound tonometer (RBT) with values obtained with the Goldmann applanation tonometer (GAT) in patients with glaucoma and ocular hypertension, and to evaluate the impact of possible differences on management decisions.Methods:  The IOP was measured with the iCare RBT and ...
Jeannette B. Rehnman, Lene Martin
openaire   +3 more sources