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Tortuous Pore Path Through the Glaucomatous Lamina Cribrosa.

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Glaucoma damages the lamina cribrosa, affecting retinal ganglion cell axons. Our study reveals that glaucoma eyes have more tortuous pore paths in the lamina cribrosa, potentially reducing axoplasmic flow.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • The lamina cribrosa is a critical site for retinal ganglion cell axons and a primary area affected in glaucoma.
  • Mechanical forces are suspected to impede axoplasmic flow, but the precise pathways of axons through lamina cribrosa pores remain unclear.

Purpose of the Study:

  • To investigate and quantify the in vivo tortuosity of lamina cribrosa pore paths in healthy and glaucomatous eyes.
  • To explore the relationship between pore path characteristics and glaucoma severity.

Main Methods:

  • Utilized swept-source optical coherence tomography to image lamina cribrosa pores in 70 subjects (16 healthy, 23 glaucoma suspect, 48 glaucomatous).
  • Employed automated segmentation and custom software for tracking individual pore paths through the lamina cribrosa.
  • Quantified pore path convergence to the optic nerve center and tortuosity.

Main Results:

  • Lamina cribrosa pore pathways consistently trended closer to the optic nerve center with depth, irrespective of disease status.
  • Eyes with glaucoma exhibited significantly more tortuous pore paths compared to healthy eyes.
  • Pore path tortuosity did not correlate with disease severity or diagnostic category.

Conclusions:

  • Increased tortuosity of lamina cribrosa pores in glaucoma may represent a key mechanism contributing to reduced axoplasmic flow.
  • Understanding these pathways offers insights into glaucoma pathogenesis and potential therapeutic targets.