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Related Experiment Videos

Vascular resistance in primary open angle glaucoma

M I Aldoori1, V J Marmion, R N Baird

  • 1Bristol Royal Infirmary, England.

Acta Ophthalmologica Scandinavica
|January 9, 1999
PubMed
Summary
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Glaucoma patients exhibit increased vascular resistance in orbital vessels, indicated by reduced diastolic flow. This resistance did not improve with treatment in eyes with moderate to severe vision loss.

Area of Science:

  • Ophthalmology
  • Vascular Physiology
  • Medical Imaging

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Elevated intraocular pressure is a primary risk factor for glaucoma.
  • Understanding vascular changes in glaucoma is crucial for disease management.

Purpose of the Study:

  • To investigate differences in orbital vascular resistance between normal individuals and glaucoma patients.
  • To assess the hemodynamic relationship between specific orbital vessels in glaucoma.

Main Methods:

  • Continuous wave Doppler technique was employed.
  • Resistance Index (RI) was calculated for two orbital vessels.
  • The ratio of resistance in the supratrochlear artery to the central retinal artery (RIST/RICRA) was determined.

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Main Results:

  • Normal subjects showed a RIST/RICRA ratio greater than 1.
  • Glaucoma patients initially had varied ratios, with some improving after treatment.
  • Eyes with moderate to severe visual field loss did not show improvement in the ratio post-treatment.

Conclusions:

  • Glaucoma is associated with increased peripheral vascular resistance and reduced diastolic flow in orbital vessels.
  • Treatment did not alter vascular resistance in advanced glaucoma.
  • Doppler assessment of orbital vascular resistance may offer insights into glaucoma pathophysiology.