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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
Ophthalmic Drug Delivery Systems01:23

Ophthalmic Drug Delivery Systems

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...
Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Related Experiment Video

Updated: Jun 25, 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

Intraocular pressure fluctuations: how much do they matter?

Kuldev Singh1, Anurag Shrivastava

  • 1Department of Ophthalmology, Stanford University School of Medicine, Glaucoma Service, Palo Alto, California 94305, USA. Kuldev.Singh@Stanford.edu

Current Opinion in Ophthalmology
|March 3, 2009
PubMed
Summary

Current research on intraocular pressure (IOP) fluctuation as a glaucoma progression risk factor shows conflicting results. Mean IOP remains a significant predictor, with continuous IOP measurement limitations hindering definitive conclusions on fluctuation

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Last Updated: Jun 25, 2026

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

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Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
08:55

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments

Published on: April 24, 2020

Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Ocular Physiology

Background:

  • Intraocular pressure (IOP) is a key factor in glaucoma pathogenesis.
  • The role of IOP fluctuation versus mean IOP in glaucoma progression is debated.
  • Existing literature presents conflicting evidence on IOP variability as an independent risk factor.

Purpose of the Study:

  • To critically review and synthesize current literature on IOP fluctuation/variation.
  • To assess the significance of IOP fluctuation as an independent risk factor for glaucoma progression.
  • To compare the predictive value of IOP fluctuation against mean IOP in glaucoma.

Main Methods:

  • Systematic literature review of studies investigating IOP fluctuation and glaucoma progression.
  • Analysis of findings from prospective randomized clinical trials.
  • Evaluation of the quality and assumptions of existing studies.

Main Results:

  • Conflicting reports exist regarding the importance of IOP fluctuation versus mean IOP.
  • A trend suggests IOP fluctuation as an independent risk factor, but study quality varies.
  • Recent evidence indicates mean IOP remains a crucial predictor, and causality assumptions are questioned.

Conclusions:

  • No conclusive evidence establishes IOP fluctuation/variation as independent risk factors for glaucoma progression.
  • Mean IOP should not be disregarded as an important predictor of glaucoma progression.
  • Limited continuous IOP measurement capabilities hinder optimal assessment of mean and variability, impacting definitive conclusions.