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Glaucoma: Overview01:25

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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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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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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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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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Related Experiment Video

Updated: Feb 27, 2026

Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
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Aging and ocular tissue stiffness in glaucoma.

Baiyun Liu1, Sara McNally2, Jason I Kilpatrick3

  • 1School of Physics, Conway Institute, University College Dublin, Dublin, Ireland; Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, Ireland.

Survey of Ophthalmology
|July 2, 2017
PubMed
Summary

Age-related stiffening of ocular tissues contributes to glaucoma progression. Understanding mechanotransduction in the trabecular meshwork and optic nerve head may reveal new glaucoma treatments.

Keywords:
agingextracellular matrixglaucomamyofibroblaststiffness

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomaterials Science

Background:

  • Glaucoma is a neurodegenerative disease causing irreversible vision loss, linked to aging.
  • Aging increases extracellular matrix stiffness, impacting ocular tissues and contributing to ophthalmic diseases.
  • Ocular tissue stiffening, particularly in the trabecular meshwork and optic nerve head, is implicated in glaucoma.

Purpose of the Study:

  • To review the role of age-related ocular stiffening in glaucoma progression.
  • To discuss the molecular mechanisms of tissue stiffening and mechanotransduction in ocular cells.
  • To explore potential therapeutic strategies targeting age-related stiffening in glaucoma.

Main Methods:

  • Literature review of age-related ocular stiffening in various eye tissues.
  • Analysis of extracellular matrix remodeling and fibrotic changes in glaucoma.
  • Examination of cellular and molecular events, including myofibroblast activation.
  • Description of mechanosensitive pathways in trabecular meshwork and lamina cribrosa cells.

Main Results:

  • Age-associated ocular tissue stiffening is a significant factor in glaucoma.
  • Extracellular matrix remodeling and fibrosis in the trabecular meshwork and optic nerve head contribute to disease progression.
  • Mechanotransduction pathways in ocular cells are activated by tissue stiffening, driving further fibrosis.
  • Specific ocular tissues affected include the trabecular meshwork, lamina cribrosa, sclera, cornea, retina, and Bruch membrane/choroid.

Conclusions:

  • Age-related ocular stiffening is a critical factor in glaucoma pathogenesis.
  • Understanding the interplay between tissue mechanics and cellular responses is key to developing novel glaucoma therapies.
  • Targeting age-related stiffening and mechanotransduction pathways offers potential for innovative glaucoma treatments.