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Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Assessment of trabecular meshwork width using swept source optical coherence tomography.

Tin A Tun1, Mani Baskaran, Ce Zheng

  • 1Singapore Eye Research Institute and Singapore National Eye Centre, 11 Third Hospital Avenue, Singapore, 168751, Singapore.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|February 26, 2013
PubMed
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The trabecular meshwork (TM) width in Chinese subjects varied by quadrant, with the inferior quadrant being the widest. Swept source optical coherence tomography (SS-OCT) accurately measured TM width, showing no association with demographic factors.

Area of Science:

  • Ophthalmology
  • Anatomy
  • Medical Imaging

Background:

  • Trabecular meshwork (TM) width is crucial for understanding aqueous humor outflow.
  • Previous measurements often assumed TM location, potentially introducing inaccuracies.
  • High-definition imaging offers improved precision in anatomical measurements.

Purpose of the Study:

  • To measure trabecular meshwork (TM) width using swept source optical coherence tomography (SS-OCT).
  • To investigate factors influencing TM width measurements.
  • To compare TM width across different ocular quadrants and between open and closed angles.

Main Methods:

  • Participants underwent gonioscopy and SS-OCT imaging.
  • Customized software was used to measure TM width from the scleral spur to Schwalbe's line on high-definition SS-OCT images.

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  • Linear regression analysis assessed associations between TM width and demographic/angle parameters.

    • Main Results:

    • Trabecular meshwork (TM) width varied significantly across quadrants, being widest inferiorly (mean 889 μm) and superiorly (mean 793 μm) compared to nasal (712 μm) and temporal (724 μm) quadrants.
    • A statistically significant difference in average TM width was observed between open (789 μm) and closed angle eyes (753 μm).
    • No significant associations were found between TM width and demographic factors or laterality.

    Conclusions:

    • Mean TM width in Chinese subjects, measured by SS-OCT, ranged from 710 to 890 μm.
    • The inferior quadrant exhibited the widest TM compared to other quadrants.
    • SS-OCT provides precise measurements of TM width, revealing quadrant-specific variations.