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Related Experiment Videos

Outflow facilities through Descemet's membrane in rabbits.

Detlev Spiegel1, Marion Schefthaler, Karin Kobuch

  • 1Department of Ophthalmology, University of Regensburg, Germany. Spiegel@eye-regensburg.de

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|April 5, 2002
PubMed
Summary

Descemet's membrane shows significant outflow resistance in rabbits, requiring the entire corneal area for pressure control. This suggests additional outflow pathways are crucial for viscocanalostomy glaucoma surgery in humans.

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Area of Science:

  • Ophthalmology
  • Glaucoma Surgery
  • Ocular Fluid Dynamics

Background:

  • The outflow pathway in viscocanalostomy, a novel glaucoma surgery, remains unclear.
  • Outflow through Descemet's membrane has been proposed as a potential mechanism.

Purpose of the Study:

  • To evaluate outflow rates through Descemet's membrane at varying intraocular pressure (IOP) levels in a rabbit model.
  • To assess the contribution of Descemet's membrane to aqueous humor outflow.

Main Methods:

  • 51 rabbit Descemet's membranes (without endothelium) were mounted in a Minuth sheet system.
  • Controlled intraocular pressures (20-50 mmHg) were applied, and fluid percolation was measured over 12 hours.
  • Flow rates were calculated based on measured fluid volume and membrane area (6.9 mm²).

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Main Results:

  • At 20 mmHg, flow rate was <0.003 µL/min.
  • Above 30 mmHg, flow rates ranged from 0.04 to 0.15 µL/min (mean 0.09 µL/min).
  • An area of at least 150 mm² of Descemet's membrane would be necessary for pressure control at high IOPs.

Conclusions:

  • Descemet's membrane exhibits considerable outflow resistance in rabbit eyes.
  • Achieving adequate pressure control solely through Descemet's membrane outflow would necessitate the entire corneal area.
  • These findings imply that additional outflow pathways are essential for effective viscocanalostomy in humans.