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Glaucoma: Overview01:25

Glaucoma: Overview

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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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Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

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Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

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When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
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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Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
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Related Experiment Video

Updated: Apr 10, 2026

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
09:03

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye

Published on: June 20, 2015

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Fundamentals and Advances in Tonometry.

Brenda Nuyen1, Kaweh Mansouri

  • 1From the *Hamilton Glaucoma Center and the Department of Ophthalmology, University of California, San Diego, La Jolla, CA; †Glaucoma Sector, Department of Ophthalmology, Geneva University Hospitals, Geneva, Switzerland; and ‡Department of Ophthalmology, University of Colorado School of Medicine, Denver, CO.

Asia-Pacific Journal of Ophthalmology (Philadelphia, Pa.)
|June 13, 2015
PubMed
Summary

Accurate intraocular pressure (IOP) measurement is crucial for glaucoma management. New 24-hour IOP monitoring methods offer hope for improved clinical practice and preventing irreversible blindness.

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Area of Science:

  • Ophthalmology
  • Medical Technology

Background:

  • Glaucoma is a leading cause of irreversible blindness globally.
  • Lowering intraocular pressure (IOP) is the primary treatment for glaucoma.
  • Accurate IOP measurement is essential for glaucoma diagnosis and management.

Purpose of the Study:

  • To review the historical evolution of tonometry.
  • To discuss current intraocular pressure (IOP) measurement instruments.
  • To explore advancements in 24-hour IOP monitoring.

Main Methods:

  • Historical overview of tonometry techniques.
  • Discussion of contemporary tonometry devices.
  • Review of emerging 24-hour IOP monitoring technologies.

Main Results:

  • Current tonometry methods are largely static and office-based.
  • Individual circadian rhythms significantly impact IOP.
  • 24-hour IOP monitoring represents a significant advancement.

Conclusions:

  • Despite advancements, limitations in current tonometry persist.
  • Continuous IOP monitoring may revolutionize glaucoma care.
  • Future clinical management may incorporate routine 24-hour IOP assessments.