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Calculation of vessel pulse wave velocities in retinal vein segments within the optic disc centre.
Sci Rep
November 2024
Lions Eye Institute, Centre for Ophthalmology and Visual Science, University of Western Australia, Crawley, Australia.
The carotid-femoral pulse wave velocity (PWV) method is used clinically to determine degrees of stiffness and other indices of disease. It is believed PWV measurement in retinal vessels may allow early detection of diseases. In this paper we present a new non-invasive method for estimating PWVs in retinal vein segments close to the optic disc centre, based on the measurement of blood column pulsation in retinal veins (reflective of vessel wall pulsation), using modified photoplethysmography (PPG).
View Article and Find Full Text PDFEstablishing the Calibration Curve of a Compressive Ophthalmodynamometry Device.
Annu Int Conf IEEE Eng Med Biol Soc
July 2023
The relationship between externally applied force and intraocular pressure was determined using an ex-vivo porcine eye model (N=9). Eyes were indented through the sclera with a convex ophthalmodynamometry head (ODM). Intraocular pressure and ophthalmodynamometric force were simultaneously recorded to establish a calibration curve of this indenter head.
View Article and Find Full Text PDFNon-invasive Assessment of Central Retinal Artery Pressure: Age and Posture-dependent Changes.
Curr Eye Res
January 2021
Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA.
: Assessment of Ocular Perfusion Pressure (OPP) requires estimation of the Mean Central Retinal Artery Pressure (MCRAP) [OPP = MCRAP-IOP]. In a seated position, MCRAP is currently estimated as 2/3 of the Mean Arterial Pressure (MAP) to account for the hydrostatic reduction of MAP at eye level. We tested a surrogate method for direct MCRAP assessment by measuring MAP with Arm-Up and cuff at eye level (AUMAP) at different postures and ages.
View Article and Find Full Text PDFMeasurement of normal retinal vascular pulse wave attenuation using modified photoplethysmography.
PLoS One
July 2020
Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia.
Pulse wave attenuation characteristics reflect compliance and resistance properties of the vessel wall as well as initial pulse generation factors. Recently, it has become possible to measure and map the retinal vessel wall pulse wave amplitudes. Predictable pulse wave amplitude distribution may allow inferences to be made concerning vascular compliance and resistance.
View Article and Find Full Text PDFRetinal venous pressure measurements in patients with Flammer syndrome and metabolic syndrome.
EPMA J
December 2017
Department of Ophthalmology, University of Basel, Mittlere Str 91, 4031 Basel, Switzerland.
Background: The purpose of this research is to analyze retinal venous pressure (RVP) of both eyes of patients who visited a Swiss ophthalmic practice and compare values among the following groups of patients with primary open-angle glaucoma (POAG), Flammer syndrome (FS), and metabolic syndrome (MetS).
Methods: RVP was measured in both eyes of all patients who visited a Swiss ophthalmic practice during March 2016 till November 2016, and the results were analyzed retrospectively. All measurements were performed by one physician by means of ophthalmodynamometry.
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