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Related Concept Videos

Equipments Used To Measure Blood Pressure01:30

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This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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New technologies for measuring intraocular pressure.

Julian Garcia-Feijoo1, Jose María Martinez-de-la-Casa1, Laura Morales-Fernandez1

  • 1Servicio de Oftalmología, Hospital Clínico San Carlos, Departamento de Oftalmología y ORL, Facultad de Medicina, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain; Cooperative Research Network on Age-Related Ocular Pathology, Visual and Life Quality, Instituto de Salud Carlos III, Madrid, Spain.

Progress in Brain Research
|November 1, 2015
PubMed
Summary

Intraocular pressure (IOP) measurement using Goldmann applanation tonometry (GAT) is limited by ocular factors. New tonometers aim to improve IOP accuracy for glaucoma diagnosis and management.

Keywords:
Corneal hysteresisCorneal thicknessCorvisDynamic contourGoldmannICareIntraocular pressureOcular response analyzerPascalReboundSensimedTonometer

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) is a primary risk factor for glaucomatous optic neuropathy.
  • Goldmann applanation tonometry (GAT) is the established standard for IOP measurement but has known limitations.
  • Ocular variables like axial length and corneal thickness significantly affect GAT readings.

Purpose of the Study:

  • To address the limitations of Goldmann applanation tonometry (GAT).
  • To explore advancements in intraocular pressure (IOP) measurement techniques.
  • To improve the accuracy of IOP assessment in glaucoma management.

Main Methods:

  • Review of existing literature on Goldmann applanation tonometry (GAT).
  • Analysis of factors influencing GAT accuracy.
  • Exploration of newly developed tonometry devices.

Main Results:

  • GAT's accuracy is compromised by ocular characteristics such as corneal properties and axial length.
  • Existing compensation methods and nomograms for GAT have not fully resolved accuracy issues.
  • Novel tonometers have been developed to overcome the limitations of conventional methods.

Conclusions:

  • Accurate intraocular pressure (IOP) measurement is critical for diagnosing and managing glaucoma.
  • Limitations of Goldmann applanation tonometry necessitate the exploration of alternative methods.
  • Emerging tonometry technologies show promise for more reliable IOP assessment.