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Related Experiment Videos

Ocular fundus lesions in divers.

P J Polkinghorne1, K Sehmi, M R Cross

  • 1Department of Clinical Ophthalmology, University of London.

Lancet (London, England)
|December 17, 1988
PubMed
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Divers show retinal abnormalities, including reduced capillary density and pigment epithelium issues, linked to diving history. These changes suggest circulatory obstruction from decompression or hyperbaric conditions.

Area of Science:

  • Ophthalmology
  • Hyperbaric Medicine
  • Physiology

Background:

  • Diving involves exposure to hyperbaric conditions and risk of decompression sickness.
  • Ocular health, particularly retinal circulation, may be affected by diving stressors.

Purpose of the Study:

  • To investigate retinal microcirculation and fundus abnormalities in divers using fluorescein angiography.
  • To correlate observed changes with diving history and potential causes.

Main Methods:

  • Retinal fluorescein angiography performed on 84 divers.
  • Comparison with a non-diver control group.
  • Analysis of retinal capillary density, microaneurysms, capillary nonperfusion, and retinal pigment epithelium abnormalities.

Main Results:

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  • Divers exhibited lower foveal retinal capillary density compared to non-divers.
  • Microaneurysms and capillary nonperfusion were observed in divers.
  • Significantly higher prevalence of retinal pigment epithelium abnormalities in divers.
  • Fundus abnormality prevalence correlated positively with diving history duration.

Conclusions:

  • Observed retinal changes in divers are consistent with retinal and choroidal circulatory obstruction.
  • Potential causes include intravascular bubble formation during decompression or altered blood/vessel behavior under hyperbaric conditions.