Multifocal lenses in a monochromat: the harbour seal
Previous photorefractive results from harbour seals indicated the presence of a multifocal lens. This was surprising because the evolution of multifocal lenses has served to compensate for chromatic aberration in animals with colour vision, which harbour seals as monochromats should not be capable o...
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fthighwire:oai:open-archive.highwire.org:jexbio:211/20/3315 2023-05-15T16:33:33+02:00 Multifocal lenses in a monochromat: the harbour seal Hanke, Frederike D. Kröger, Ronald H. H. Siebert, Ursula Dehnhardt, Guido 2008-10-15 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/211/20/3315 https://doi.org/10.1242/jeb.018747 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/211/20/3315 http://dx.doi.org/10.1242/jeb.018747 Copyright (C) 2008, Company of Biologists Research Article TEXT 2008 fthighwire https://doi.org/10.1242/jeb.018747 2015-02-28T13:01:26Z Previous photorefractive results from harbour seals indicated the presence of a multifocal lens. This was surprising because the evolution of multifocal lenses has served to compensate for chromatic aberration in animals with colour vision, which harbour seals as monochromats should not be capable of. To gain insight into the lens optics of these animals, we extended our photorefractive measurements in live seals under water and in air and, additionally, analyzed eight extracted juvenile harbour seal lenses with schlieren photography and a laser scanning technique. The results from all methods applied support the presence of multifocal lenses in harbour seals. However, the functional significance of multiple focal lengths in harbour seal lenses remains speculative. Interestingly, the slit pupils of harbour seals cannot be considered to be an adaptation to the multifocal optical system of the eye. Text harbour seal HighWire Press (Stanford University) Journal of Experimental Biology 211 20 3315 3322 |
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HighWire Press (Stanford University) |
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English |
topic |
Research Article |
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Research Article Hanke, Frederike D. Kröger, Ronald H. H. Siebert, Ursula Dehnhardt, Guido Multifocal lenses in a monochromat: the harbour seal |
topic_facet |
Research Article |
description |
Previous photorefractive results from harbour seals indicated the presence of a multifocal lens. This was surprising because the evolution of multifocal lenses has served to compensate for chromatic aberration in animals with colour vision, which harbour seals as monochromats should not be capable of. To gain insight into the lens optics of these animals, we extended our photorefractive measurements in live seals under water and in air and, additionally, analyzed eight extracted juvenile harbour seal lenses with schlieren photography and a laser scanning technique. The results from all methods applied support the presence of multifocal lenses in harbour seals. However, the functional significance of multiple focal lengths in harbour seal lenses remains speculative. Interestingly, the slit pupils of harbour seals cannot be considered to be an adaptation to the multifocal optical system of the eye. |
format |
Text |
author |
Hanke, Frederike D. Kröger, Ronald H. H. Siebert, Ursula Dehnhardt, Guido |
author_facet |
Hanke, Frederike D. Kröger, Ronald H. H. Siebert, Ursula Dehnhardt, Guido |
author_sort |
Hanke, Frederike D. |
title |
Multifocal lenses in a monochromat: the harbour seal |
title_short |
Multifocal lenses in a monochromat: the harbour seal |
title_full |
Multifocal lenses in a monochromat: the harbour seal |
title_fullStr |
Multifocal lenses in a monochromat: the harbour seal |
title_full_unstemmed |
Multifocal lenses in a monochromat: the harbour seal |
title_sort |
multifocal lenses in a monochromat: the harbour seal |
publisher |
Company of Biologists |
publishDate |
2008 |
url |
http://jeb.biologists.org/cgi/content/short/211/20/3315 https://doi.org/10.1242/jeb.018747 |
genre |
harbour seal |
genre_facet |
harbour seal |
op_relation |
http://jeb.biologists.org/cgi/content/short/211/20/3315 http://dx.doi.org/10.1242/jeb.018747 |
op_rights |
Copyright (C) 2008, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.018747 |
container_title |
Journal of Experimental Biology |
container_volume |
211 |
container_issue |
20 |
container_start_page |
3315 |
op_container_end_page |
3322 |
_version_ |
1766023239952236544 |