Multifocal lenses in a monochromat: the harbour seal
(2008) In Journal of Experimental Biology 211(20). p.3315-3322- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1285734
- author
- Hanke, Frederike D. ; Kröger, Ronald LU ; Siebert, Ursula and Dehnhardt, Guido
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- lens, harbour seal, Phoca vitulina, multifocal
- in
- Journal of Experimental Biology
- volume
- 211
- issue
- 20
- pages
- 3315 - 3322
- publisher
- The Company of Biologists Ltd
- external identifiers
-
- wos:000259866400016
- scopus:55549121249
- pmid:18840666
- ISSN
- 1477-9145
- DOI
- 10.1242/jeb.018747
- language
- English
- LU publication?
- yes
- id
- 9209b899-1f79-47d3-9882-731dfcac2fe7 (old id 1285734)
- date added to LUP
- 2016-04-01 12:26:06
- date last changed
- 2022-01-27 03:43:59
@article{9209b899-1f79-47d3-9882-731dfcac2fe7,
abstract = {{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.}},
author = {{Hanke, Frederike D. and Kröger, Ronald and Siebert, Ursula and Dehnhardt, Guido}},
issn = {{1477-9145}},
keywords = {{lens; harbour seal; Phoca vitulina; multifocal}},
language = {{eng}},
number = {{20}},
pages = {{3315--3322}},
publisher = {{The Company of Biologists Ltd}},
series = {{Journal of Experimental Biology}},
title = {{Multifocal lenses in a monochromat: the harbour seal}},
url = {{http://dx.doi.org/10.1242/jeb.018747}},
doi = {{10.1242/jeb.018747}},
volume = {{211}},
year = {{2008}},
}