PMID: 7940150May 1, 1994Paper

Validity of pulsatile ocular blood flow measurements

Survey of Ophthalmology
D M Silver, R A Farrell

Abstract

The determination of average net pulsatile ocular blood flow form measurements of the intraocular pressure (IOP) pulse is based upon 1) an accurate measurement of IOP and its time variation; 2) a knowledge of the relation between the volume of the living eye and its IOP; 3) a physical model for the flow of blood through the eye: and 4) a concept of steady venous outflow from the eye. Each of these premises needs to be examined. The present analysis assesses the validity of the pneumatic tonometer for measuring the pressure in a flowing column of gas that is directed toward a thin membrane that is in contact with the surface of the cornea. The pressure of this stream of gas exerts a force against the cornea that depresses the corneal surface against the opposing force of the IOP. The balance of these forces and the resultant effect on the tonometer pressure sensor is described by the theories of elasticity, thermodynamics and fluid mechanics. In this treatment, differential equations are solved for the elastic deflections of the cornea subject to the opposing intraocular and tonometer pressures. This permits the pressure in the chamber of the pneumatic tonometer to be related through first principles to the IOP. The response of ...Continue Reading

References

Mar 1, 1975·Experimental Eye Research·R E WalkerM E Langham
May 1, 1972·Experimental Eye Research·R E WalkerM E Langham
Jan 1, 1972·Experimental Eye Research·R E Walker, T L Litovitz
Jan 1, 1965·Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift für Augenheilkunde·W K McEwen, R St Helen

❮ Previous
Next ❯

Citations

Sep 27, 2000·American Journal of Ophthalmology·W E SponselT Friberg
Mar 3, 2001·American Journal of Ophthalmology·O GeyerD M Silver
Aug 15, 2003·Ophthalmology·Archana BhanVelota Sung
Oct 9, 2002·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Andrew KC LamChi-Ho To
Feb 28, 2007·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Bibianna S Y Yu, Andrew K C Lam
Mar 20, 2004·The British Journal of Ophthalmology·E PolskaL Schmetterer
Oct 19, 2004·The British Journal of Ophthalmology·A C BrowningH S Dua
Oct 20, 2006·The British Journal of Ophthalmology·Andrew J Morgan, Sarah L Hosking
Jun 20, 2007·The British Journal of Ophthalmology·Itay Ben ZionHanna J Garzozi
Jan 30, 1999·The British Journal of Ophthalmology·L FontanaR A Hitchings
Dec 6, 2001·The British Journal of Ophthalmology·S J ChenJ H Liu
Jun 26, 2001·The British Journal of Ophthalmology·R WatkinsE Linardos
Dec 19, 2002·The British Journal of Ophthalmology·S L HoskingA K Gupta
Jul 18, 2014·PloS One·Monika E DanielewskaD Robert Iskander
Aug 29, 2001·Journal of Cataract and Refractive Surgery·P PiankaO Geyer
Nov 10, 2009·Journal of Biomedical Optics·Nikolaus DragostinoffLeopold Schmetterer
Jun 4, 2014·Current Eye Research·Doreen SchmidlAlina Popa-Cherecheanu
Nov 28, 2007·Acta Ophthalmologica·Hemma ReschGuido T Dorner
Oct 20, 2011·Current Eye Research·Niklas PlangeAndreas Remky
Feb 13, 2001·Microvascular Research·B KissL Schmetterer
Nov 12, 2014·Life·Emily S NelsonJerry G Myers
May 31, 2002·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Andrew K C LamChi-Ho To
Feb 24, 2018·The British Journal of Ophthalmology·Giacomo CalzettiLeopold Schmetterer
Jun 19, 2004·Eye·Chieh-Chih TsaiYau-Huei Wei
Oct 1, 1996·Journal of Cataract and Refractive Surgery·C W SpraulG K Lang
Sep 11, 2002·European Journal of Ophthalmology·M CentofantiA Harris
Nov 24, 2004·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Pinakin GunvantDaniel James O'Leary
Feb 1, 2017·Acta Ophthalmologica·Karin R PillunatLutz E Pillunat
Mar 22, 2002·Acta Ophthalmologica Scandinavica·Gerasimos T GeorgopoulosGuenter K Krieglstein

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.