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Related Experiment Video

Updated: Mar 18, 2026

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
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The pressure difference between eye and brain changes with posture.

Anders Eklund1,2, Gauti Jóhannesson3, Elias Johansson4

  • 1Department of Radiation Sciences, Umeå University, Umeå, Sweden.

Annals of Neurology
|June 29, 2016
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Summary
This summary is machine-generated.

Posture significantly affects the pressure difference between intraocular pressure (IOP) and intracranial pressure (ICP). This finding may explain vision changes in microgravity and aid understanding of glaucoma and idiopathic intracranial hypertension.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Space Medicine

Background:

  • Intraocular pressure (IOP) and intracranial pressure (ICP) are critical metrics in neurological and ophthalmological health.
  • Understanding the relationship between IOP and ICP, particularly the trans-lamina cribrosa pressure difference (TLCPD), is vital for diagnosing conditions like glaucoma and idiopathic intracranial hypertension.
  • Spaceflight-induced visual impairment is a growing concern, potentially linked to altered pressure dynamics.

Purpose of the Study:

  • To investigate the influence of body posture on the difference between simultaneously measured ICP and IOP.
  • To determine the postural effects on the trans-lamina cribrosa pressure difference (TLCPD).
  • To explore the implications for understanding visual impairments in microgravity and neurological conditions.

Main Methods:

  • Simultaneous measurement of ICP (via lumbar puncture) and IOP in 11 healthy volunteers.
  • Measurements were taken in supine, sitting, and 9° head-down tilt (HDT) positions.
  • Magnetic resonance imaging (MRI) was used to estimate hydrostatic effects on pressure at the lamina cribrosa.

Main Results:

  • The TLCPD varied significantly with posture: 12.3 mmHg (supine), 19.8 mmHg (sitting), and 6.6 mmHg (HDT).
  • An estimated 24-hour average TLCPD on Earth was 17.3 mmHg.
  • Simulated microgravity conditions resulted in an estimated average TLCPD of 6.7 mmHg.

Conclusions:

  • Body posture significantly alters the TLCPD, offering a physiological explanation for vision issues in microgravity.
  • Postural assessment of IOP-ICP difference may provide new insights into the pathophysiology of idiopathic intracranial hypertension and glaucoma.
  • Findings have implications for astronaut health and the management of intracranial pressure disorders.