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Visual function and retinal vessel diameters during hyperthermia in man.

Bettina Hagström Jensen1,2, Thue Bram1,2, Per Kappelgaard1,2

  • 1Faculty of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark.

Acta Ophthalmologica
|December 22, 2016
PubMed
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Elevated core body temperature improved temporal visual resolution and dilated retinal vessels in healthy adults. Spatial contrast sensitivity remained unaffected, with all measures returning to baseline after cooling.

Area of Science:

  • Ophthalmology
  • Physiology
  • Human Health

Background:

  • Core body temperature influences physiological processes.
  • Visual system function may be modulated by thermal changes.

Purpose of the Study:

  • To investigate the impact of induced hyperthermia on visual functions.
  • To assess changes in temporal and spatial contrast sensitivity.
  • To measure alterations in retinal vessel diameters during elevated body temperature.

Main Methods:

  • 13 healthy volunteers underwent controlled hyperthermia (target +1.1°C).
  • Temporal visual resolution was assessed using critical flicker fusion frequency.
  • Spatial contrast sensitivity was measured with the Freiburg Vision Test.
  • Retinal trunk vessel diameters were quantified using scanning laser ophthalmoscopy.
Keywords:
body temperaturecontrast sensitivityflicker fusionretina/blood supplyretina/metabolism

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Main Results:

  • A mean core body temperature increase of 1.02°C improved flicker sensitivity by 2.66%.
  • Retinal artery and vein diameters increased by 2.80% and 2.95%, respectively.
  • No significant changes were observed in spatial contrast sensitivity; all parameters normalized post-cooling.

Conclusions:

  • Increased core body temperature enhances temporal visual processing.
  • Hyperthermia leads to dilation of retinal vessels, suggesting increased retinal metabolism.
  • The findings indicate a link between elevated body temperature and improved retinal function.