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Aqueous outflow regulation: Optical coherence tomography implicates pressure-dependent tissue motion.

Chen Xin1, Ruikang K Wang2, Shaozhen Song3

  • 1Department of Bioengineering, University of Washington, USA; Department of Ophthalmology, Beijing Anzhen Hospital, Capital Medical University, China.

Experimental Eye Research
|June 16, 2016
PubMed
Summary

New imaging reveals hinged flaps in collector channels that regulate eye pressure by opening and closing with trabecular meshwork motion, offering insights into glaucoma. This discovery advances understanding of aqueous humor outflow regulation.

Keywords:
AqueousCollector channelsGlaucomaIntraocular pressureLymphaticsOptical coherence tomographyPulsatile flowSchlemm’s canalTrabecular meshwork

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Area of Science:

  • Ophthalmology
  • Biomechanics
  • Medical Imaging

Background:

  • Glaucoma, a leading cause of blindness, involves optic nerve damage linked to abnormal intraocular pressure regulation.
  • Aqueous humor outflow through the trabecular meshwork, Schlemm's canal, and collector channels is critical for maintaining eye pressure.
  • The precise location and mechanisms of aqueous outflow regulation remain incompletely understood.

Purpose of the Study:

  • To investigate the mechanisms of aqueous humor outflow regulation in the human eye.
  • To identify novel anatomical structures and dynamic processes involved in regulating intraocular pressure.
  • To develop and apply advanced imaging technologies for studying ocular fluid dynamics.

Main Methods:

  • Utilized high-resolution spectral domain optical coherence tomography (SD-OCT) for ex vivo imaging of collector channel entrances in human eyes.
  • Employed phase-sensitive OCT for in vivo, real-time quantification of pulse-dependent trabecular tissue motion.
  • Experimentally manipulated transtrabecular pressure gradients to observe tissue responses.

Main Results:

  • Identified hinged flaps or leaflets at the entrances of collector channels using ex vivo SD-OCT.
  • Observed that these collector channel flaps open and close synchronously with pressure-dependent trabecular meshwork motion.
  • Demonstrated real-time, pulsatile motion of trabecular tissue in vivo, which ceases when aqueous outflow is obstructed.

Conclusions:

  • Aqueous outflow regulation involves synchronous, pressure-dependent motion across a network of tissues, including those beyond Schlemm's canal.
  • The newly identified collector channel flaps play a role in regulating aqueous humor dynamics.
  • Advanced OCT imaging technologies provide new insights into glaucoma pathophysiology and potential therapeutic targets.