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Fluctuations in intra-ocular pressure with sleep: II. Time course of IOP decrease after waking from sleep.

B Brown1, P Burton, S Mann

  • 1Department of Optometry, Queensland Institute of Technology, Brisbane, Australia.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1988
PubMed
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Intra-ocular pressure (IOP) is elevated after sleep in normal subjects. IOP returns to baseline exponentially, potentially influenced by melatonin or eye movements.

Area of Science:

  • Ophthalmology
  • Sleep Medicine
  • Physiology

Background:

  • Intra-ocular pressure (IOP) is a critical factor in ocular health.
  • Sleep significantly impacts physiological processes, including ocular parameters.

Purpose of the Study:

  • To investigate the immediate post-sleep intra-ocular pressure (IOP) in normal subjects.
  • To characterize the time course of IOP recovery to baseline after sleep.

Main Methods:

  • IOP measurements were taken in 14 healthy subjects immediately upon waking from at least 5 hours of sleep.
  • Measurements were recorded at approximately 15-second intervals for 20 minutes.

Main Results:

  • All subjects exhibited elevated IOP immediately after waking.

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  • IOP returned to baseline levels in an approximately exponential manner.
  • The time constant for IOP recovery ranged from 133.5 s to 1056.9 s, with a mean of 404.8 s.

    • Conclusions:

    • Post-sleep elevated IOP is a common finding in normal individuals.
    • The observed IOP decrease may be linked to changes in melatonin levels or ocular biomechanics like accommodation and eye movements.