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An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude
Dissertation (MSc)--University of Pretoria, 2006.
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University of Pretoria
2013
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| _version_ | 1867613584322723840 |
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| access_status_str | Open Access |
| author2 | Le Roux, C.G.J. |
| author_browse | Le Roux, C.G.J. |
| author_facet | Le Roux, C.G.J. |
| collection | Thesis |
| dc_rights_str_mv | © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26401 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:28.311Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/26401 An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude Le Roux, C.G.J. MacFarlane, Campbell Hypoxia Colour vision Contrast sensitivity Phorias Oxygen commencement altitude UCTD Dissertation (MSc)--University of Pretoria, 2006. The altitude at which oxygen supplementation should commence to be administered to aircrew in South Africa, flying in unpressurised aircraft is 12,000 feet. Above that altitude effects of reduced tissue oxygen content (hypoxia) become significant. Vision is particularly sensitive to hypoxia, and it was decided to test visual parameters at 12,000 feet to see if there were any subtle changes which might impair flight safety. It this were so, the level at which oxygen supplementation should commence would have to be lowered. The visual parameters to be assessed, all important in aviation, were colour vision, contrast sensitivity, and the presence of phorias (potential squints). 37 Healthy volunteers had these parameters assessed in an altitude chamber at ground level, 8,000 feet and 12,000 feet. Analysis of the results revealed no clinically significant degradation of vision at 12,000 feet, and it was concluded that the present altitude at which oxygen supplementation should begin (12,000 feet) is appropriate. It was advised that further testing should take place in subjects based at sea level. School of Health Systems and Public Health (SHSPH) Unrestricted 2013-09-07T05:06:09Z 2005-02-01 2013-09-07T05:06:09Z 2003-03-09 2006-02-01 2005-02-01 Dissertation MacFarlane, C 2003, An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26401 > http://hdl.handle.net/2263/26401 http://upetd.up.ac.za/thesis/available/etd-02012005-134122/ © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Hypoxia Colour vision Contrast sensitivity Phorias Oxygen commencement altitude UCTD An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title | An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title_full | An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title_fullStr | An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title_full_unstemmed | An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title_short | An assessment of deterioration of colour vision, contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| title_sort | assessment of deterioration of colour vision contrast sensitivity and phorias as a result of hypoxia in persons resident at altitude |
| topic | Hypoxia Colour vision Contrast sensitivity Phorias Oxygen commencement altitude UCTD |
| url | http://hdl.handle.net/2263/26401 http://upetd.up.ac.za/thesis/available/etd-02012005-134122/ |