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Related Experiment Video

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Diffusion Tensor Imaging of Visual Pathway Abnormalities in Five Glaucoma Animal Models.

Max K Colbert1, Leon C Ho2, Yolandi van der Merwe2

  • 1Department of Ophthalmology, NYU Grossman School of Medicine, NYU Langone Health, New York University, New York, New York, United States.

Investigative Ophthalmology & Visual Science
|August 19, 2021
PubMed
Summary

Diffusion tensor imaging (DTI) revealed disrupted visual pathway integrity in multiple glaucoma animal models due to elevated intraocular pressure (IOP). These findings highlight DTI

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Medical Imaging

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Understanding visual pathway damage in glaucoma is crucial for developing effective treatments.
  • Diffusion tensor imaging (DTI) offers a non-invasive method to assess white matter integrity.

Purpose of the Study:

  • To characterize visual pathway integrity in five distinct glaucoma animal models.
  • To evaluate the utility of diffusion tensor imaging (DTI) in detecting microstructural changes in the optic nerve and optic tract.
  • To compare DTI findings across experimentally induced and genetically determined glaucoma models.

Main Methods:

  • Evaluated two inducible (microbead, laser) and three genetic (DBA/2J, LTBP2 mutant, TBK1) glaucoma models.
  • Measured DTI parameters: fractional anisotropy (FA), axial diffusivity (AD), and radial diffusivity (RD) along the optic nerve and tract.
  • Compared DTI metrics between glaucoma models and their respective healthy controls.

Main Results:

  • Elevated intraocular pressure (IOP) was confirmed in all models except transgenic TBK1 mice.
  • Significantly reduced FA and increased RD were observed in inducible and genetic glaucoma models (excluding TBK1).
  • DBA/2J mice showed reduced AD, while TBK1 mice exhibited no significant DTI changes compared to controls.

Conclusions:

  • Chronic IOP elevation leads to decreased FA and increased RD in visual pathways, indicating microstructural disruption.
  • DTI is effective in characterizing visual pathway damage in various glaucoma models.
  • Axial diffusivity changes vary across models, suggesting differential pathological processes.