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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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Experimental scleral cross-linking increases glaucoma damage in a mouse model.

Elizabeth C Kimball1, Cathy Nguyen1, Matthew R Steinhart1

  • 1Glaucoma Center of Excellence, Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, MD, USA.

Experimental Eye Research
|October 7, 2014
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Scleral cross-linking with glyceraldehyde (GA) in mice increased susceptibility to glaucoma damage. This experimental alteration of the sclera heightened retinal ganglion cell axon loss under elevated intraocular pressure.

Keywords:
CollagenCross-linkingExtracellular matrixGlaucomaGlyceraldehydeMouseRetinal ganglion cellSclera

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Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Glaucoma Research

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • The sclera's biomechanical properties influence intraocular pressure (IOP) and optic nerve susceptibility.
  • Understanding scleral changes in glaucoma pathogenesis is crucial.

Purpose of the Study:

  • To investigate the impact of scleral cross-linking on glaucoma damage susceptibility.
  • To determine if altering scleral biomechanics affects retinal ganglion cell (RGC) survival.

Main Methods:

  • Subconjunctival injections of glyceraldehyde (GA) were administered to CD1 mice.
  • Elevated IOP was induced using bead injection models.
  • Scleral cross-linking, permeability, and mechanical properties were assessed.
  • RGC axon loss was quantified via histological analysis.

Main Results:

  • GA treatment significantly increased scleral cross-linking and decreased scleral permeability.
  • Scleral cross-linking resulted in steeper pressure-strain behavior.
  • GA-treated eyes showed significantly greater RGC axon loss under elevated IOP.

Conclusions:

  • Experimental scleral cross-linking increases susceptibility to RGC damage in a mouse model.
  • Alterations in scleral biomechanics may play a role in glaucoma progression.
  • This study provides novel insights into scleral contributions to glaucoma pathogenesis.