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Related Experiment Videos

Aqueous flow in open-angle glaucoma

L I Larsson1, E S Rettig, R F Brubaker

  • 1Department of Ophthalmology, Mayo Clinic.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|March 1, 1995
PubMed
Summary

In open-angle glaucoma patients, aqueous humor flow is not suppressed without treatment and shows a nocturnal increase. This circadian rhythm is present but not clinically significant for intraocular pressure.

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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Circadian Biology

Background:

  • Open-angle glaucoma is a leading cause of irreversible blindness.
  • Understanding aqueous humor dynamics is crucial for glaucoma management.
  • The role of circadian rhythms in ocular fluid dynamics is not fully elucidated.

Purpose of the Study:

  • To quantify aqueous humor dynamics in open-angle glaucoma patients.
  • To investigate aqueous humor flow during treatment withdrawal.
  • To determine the presence of a circadian rhythm in aqueous humor flow in glaucoma.

Main Methods:

  • Study included 20 open-angle glaucoma patients and 20 healthy controls.
  • Aqueous humor flow measured via fluorescein clearance using fluorophotometry.
  • Outflow facility assessed by tonography; intraocular pressure measured by applanation tonometry.

Main Results:

  • No significant difference in daytime aqueous humor flow between glaucoma patients and controls.
  • Elevated nocturnal aqueous humor flow observed in open-angle glaucoma patients compared to controls.
  • Circadian rhythm of aqueous humor flow was confirmed in the glaucoma cohort.

Conclusions:

  • Aqueous humor flow is not suppressed in untreated open-angle glaucoma.
  • A slight nocturnal increase in aqueous flow occurs in glaucoma patients during sleep.
  • This nocturnal flow variation is not clinically significant for intraocular pressure.

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