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The uveoscleral outflow routes

S F Nilsson1

  • 1siv.nilsson@fysiologi.uu.se

Eye (London, England)
|January 1, 1997
PubMed
Summary

Aqueous humour drainage via the uveoscleral pathway is significant in primates but less so in other mammals. Ciliary muscle tone and prostaglandins influence this outflow, impacting intraocular pressure.

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Area of Science:

  • Ophthalmology
  • Fluid Dynamics
  • Physiology

Background:

  • The anterior chamber lacks an epithelial barrier, allowing aqueous humour passage into the ciliary muscle.
  • Uveoscleral outflow is a significant drainage route for aqueous humour, particularly in primates.

Purpose of the Study:

  • To investigate the contribution and regulation of uveoscleral aqueous humour outflow.
  • To understand how factors like ciliary muscle tone and prostaglandins affect intraocular pressure.

Main Methods:

  • Review of existing literature on aqueous humour dynamics.
  • Analysis of studies measuring uveoscleral outflow in various species.
  • Examination of the effects of pharmacological agents (pilocarpine, atropine) and conditions (uveitis) on outflow.

Main Results:

  • Uveoscleral outflow constitutes 40-60% in monkeys, but only 3-8% in cats and rabbits.
  • Human uveoscleral outflow is estimated at <15% directly, but indirectly calculated as ~35% in young adults and 3% in elderly.
  • Outflow is pressure-insensitive in normal monkeys but becomes sensitive with cyclodialysis or uveitis.
  • Ciliary muscle contraction decreases, while relaxation increases uveoscleral outflow.
  • Prostaglandins lower intraocular pressure by enhancing uveoscleral outflow via ciliary muscle relaxation and extracellular matrix changes.

Conclusions:

  • The uveoscleral pathway plays a variable but crucial role in aqueous humour drainage across species.
  • Ciliary muscle tone is a key regulator of aqueous humour distribution between conventional and uveoscleral routes.
  • Prostaglandin-mediated increases in uveoscleral outflow offer a therapeutic target for lowering intraocular pressure.

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