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Related Concept Videos

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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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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Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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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...
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Related Experiment Video

Updated: Oct 3, 2025

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Glaucoma - 'A Stiff Eye in a Stiff Body'.

Sarah Powell1,2, Mustapha Irnaten2, Colm O'Brien1,2

  • 1Department of Ophthalmology, Mater Misericordiae University Hospital, Dublin, Ireland.

Current Eye Research
|February 21, 2022
PubMed
Summary

Glaucoma, an optic neuropathy, is linked to increased tissue stiffness in both the eye and body, particularly after age 60. This review explores the connection between tissue stiffness and glaucoma progression.

Keywords:
Glaucomaagingextracellular matrixfibrosismechanotransductiontissue stiffness

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Last Updated: Oct 3, 2025

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
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Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses

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Area of Science:

  • Ophthalmology and Biomedical Engineering
  • Cellular Mechanobiology

Background:

  • Glaucoma is a progressive optic neuropathy associated with aging and increased systemic tissue stiffness.
  • Molecularly, this involves collagen deposition and elastin loss, leading to reduced tissue elasticity and aberrant biomechanical compliance.
  • Increased tissue stiffness drives myofibroblast activation via mechanotransduction pathways.

Approach:

  • This review synthesizes evidence from histological, imaging, and force measurement studies of glaucomatous eyes.
  • It examines ocular tissues such as the trabecular meshwork, Schlemm's canal, cornea, sclera, and lamina cribrosa for increased stiffness.
  • The review explores the molecular mechanisms linking tissue stiffness to extracellular matrix deposition and fibrosis.

Key Points:

  • Glaucomatous eyes exhibit increased stiffness in multiple ocular tissues compared to age-matched controls.
  • Systemic tissue stiffness is a significant factor associated with glaucoma prevalence.
  • Fibrosis and extracellular matrix deposition are consequences of increased tissue stiffness in glaucoma.

Conclusions:

  • Glaucoma can be conceptualized as a condition characterized by a 'stiff eye in a stiff body'.
  • Understanding the role of tissue stiffness offers potential therapeutic targets for attenuating glaucoma progression.