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BMC Ophthalmol. 2018 Jun 25;18(1):149. doi: 10.1186/s12886-018-0816-0.

Antarctica eye study: a prospective study of the effects of overwintering on ocular parameters and visual function.

Author information

1
University College London, London, UK. matthew.stahl.11@ucl.ac.uk.
2
Department of Medicine, Wexham Park Hospital, Wexham, Slough, SL2 4HL, UK. matthew.stahl.11@ucl.ac.uk.
3
King's College London, London, UK.
4
University of Fribourg, Fribourg, Switzerland.
5
Department of Trauma & Orthopaedic Surgery, Royal Infirmary of Edinburgh, Edinburgh, Scotland.
6
University of Southampton Medical School, Southampton, UK.
7
Clinical Research Department, International Centre for Eye Health, London School of Hygiene & Tropical Medicine, London, UK.
8
Moorfields Eye Hospital NHS Foundation Trust, London, UK.
9
Queens University Belfast, Belfast, UK.

Abstract

BACKGROUND:

In 2013 five polar explorers attempted to complete the first Trans-Antarctic Winter Traverse (TAWT). This study presents the ophthalmological findings for this group, who overwintered in Antarctica as part of the White Mars Human Science Protocol. Antarctic crews are exposed to extreme cold, chronic hypoxia and altered day-night cycles. Previous studies of Antarctic explorers have focused on the prolonged effect of ultraviolet radiation including the development of ultraviolet keratitis and accelerated cataract formation. This is the first study of its kind to investigate the effect of overwintering in Antarctica on the human eye.

METHODS:

Pre and post-expedition clinical observations were made including visual acuity, contrast sensitivity, colour vision, auto-refraction, subjective refraction, retinal examination, retinal autofluoresence and retinal thickness, which were graded for comparison. During the expedition additional observations were made on a monthly basis including LogMAR visual acuity, autorefraction and intraocular pressure.

RESULTS:

No significant differences between pre and post-expedition observations were found, including visual acuity, contrast sensitivity, colour vision, refraction, visual fields, intraocular pressure and retinal examination. There was a small but statistically significant decrease in retinal thickness across all regions of the retina, except for the macular and fovea, in all explorers. Intra-expedition observations remained within normal limits.

CONCLUSION:

Reassuringly, the human eye remains largely unchanged by exposure to the extreme conditions encountered during the Antarctic winter, however, further research is needed to investigate changes in retinal thickness. This may have implications for scientists who spend prolonged periods of time in the polar regions, as well as those who have prolonged exposure to the extreme cold or chronic hypoxia in other settings.

KEYWORDS:

Altitude; Antarctica; Eye; White Mars

PMID:
29940901
PMCID:
PMC6019514
DOI:
10.1186/s12886-018-0816-0
[Indexed for MEDLINE]
Free PMC Article

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