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Related Experiment Video

Updated: Dec 27, 2025

Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Central Retinal Vessel Trunk Caliber Changes After Short-term Intraocular Pressure Elevation.

Qi Zhang1,2, Cai Xia Lin1, Hongli Yang3

  • 1Beijing Ophthalmology and Visual Sciences Key Laboratory, Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital Medical University, Beijing.

Journal of Glaucoma
|February 26, 2020
PubMed
Summary

Short-term intraocular pressure elevation widens the central retinal vein at lower levels but compresses it at higher levels. Retinal artery caliber remains unaffected by intraocular pressure changes.

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Area of Science:

  • Ophthalmology
  • Retinal Vascular Physiology

Background:

  • Intraocular pressure (IOP) plays a critical role in ocular health.
  • Understanding the dynamic response of retinal vasculature to IOP fluctuations is crucial for diagnosing and managing various eye conditions.

Purpose of the Study:

  • To investigate the short-term changes in the calibers of the central retinal vein trunk (CRVT) and central retinal artery trunk (CRAT) in response to a controlled elevation of IOP.

Main Methods:

  • A prospective observational study involving 101 eyes of acute primary angle-closure suspects.
  • Participants underwent a 2-hour dark room prone provocative test (DRPPT) to induce short-term IOP elevation.
  • Measurements of CRVT and CRAT calibers were performed using fundus photography before and after the DRPPT, alongside tonometry.

Main Results:

  • A significant increase in mean CRVT caliber (101.8±25.9 to 107.7±26.6 μm, P<0.001) was observed following IOP elevation.
  • CRVT widening was more pronounced at lower IOP rises (<6 mmHg) and diminished at higher IOP rises (>15 mmHg).
  • The CRAT caliber showed no significant change (110.3±24.2 vs. 109.7±21.5 μm, P=0.54) during the IOP elevation.

Conclusions:

  • Short-term IOP elevation can cause CRVT widening at lower levels, suggesting a physiological response.
  • At higher IOP levels, the increased pressure may lead to CRVT compression.
  • Retinal artery diameters appear to be less sensitive to short-term IOP fluctuations due to higher intraluminal pressure.