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Optical advantages and function of multifocal spherical fish lenses

Gagnon, Yakir; Söderberg, Bo LU and Kröger, Ronald LU (2012) In Journal of the Optical Society of America A 29(9). p.1786-1793
Abstract
The spherical crystalline lenses in the eyes of many fish species are well-suited models for studies on how natural selection has influenced the evolution of the optical system. Many of these lenses exhibit multiple focal lengths when illuminated with monochromatic light. Similar multifocality is present in a majority of vertebrate eyes, and it is assumed to compensate for the defocusing effect of longitudinal chromatic aberration. In order to identify potential optical advantages of multifocal lenses, we studied their information transfer capacity by computer modeling. We investigated four lens types: the lens of Astatotilapia burtoni, an African cichlid fish species, an equivalent monofocal lens, and two artificial multifocal lenses.... (More)
The spherical crystalline lenses in the eyes of many fish species are well-suited models for studies on how natural selection has influenced the evolution of the optical system. Many of these lenses exhibit multiple focal lengths when illuminated with monochromatic light. Similar multifocality is present in a majority of vertebrate eyes, and it is assumed to compensate for the defocusing effect of longitudinal chromatic aberration. In order to identify potential optical advantages of multifocal lenses, we studied their information transfer capacity by computer modeling. We investigated four lens types: the lens of Astatotilapia burtoni, an African cichlid fish species, an equivalent monofocal lens, and two artificial multifocal lenses. These lenses were combined with three detector arrays of different spectral properties: the cone photoreceptor system of A. burtoni and two artificial arrays. The optical properties compared between the lenses were longitudinal spherical aberration curves, point spread functions, modulation transfer functions, and imaging characteristics. The multifocal lenses had a better balance between spatial and spectral information than the monofocal lenses. Additionally, the lens and detector array had to be matched to each other for optimal function. (C) 2012 Optical Society of America (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Optical Society of America A
volume
29
issue
9
pages
1786 - 1793
publisher
Optical Society of America
external identifiers
  • wos:000309060000004
  • scopus:84866537106
ISSN
1084-7529
DOI
10.1364/JOSAA.29.001786
language
English
LU publication?
yes
id
7ebc4062-0618-43c9-a751-77a4bcb0663d (old id 3191327)
date added to LUP
2012-12-03 12:20:46
date last changed
2017-01-01 05:51:25
@article{7ebc4062-0618-43c9-a751-77a4bcb0663d,
  abstract     = {The spherical crystalline lenses in the eyes of many fish species are well-suited models for studies on how natural selection has influenced the evolution of the optical system. Many of these lenses exhibit multiple focal lengths when illuminated with monochromatic light. Similar multifocality is present in a majority of vertebrate eyes, and it is assumed to compensate for the defocusing effect of longitudinal chromatic aberration. In order to identify potential optical advantages of multifocal lenses, we studied their information transfer capacity by computer modeling. We investigated four lens types: the lens of Astatotilapia burtoni, an African cichlid fish species, an equivalent monofocal lens, and two artificial multifocal lenses. These lenses were combined with three detector arrays of different spectral properties: the cone photoreceptor system of A. burtoni and two artificial arrays. The optical properties compared between the lenses were longitudinal spherical aberration curves, point spread functions, modulation transfer functions, and imaging characteristics. The multifocal lenses had a better balance between spatial and spectral information than the monofocal lenses. Additionally, the lens and detector array had to be matched to each other for optimal function. (C) 2012 Optical Society of America},
  author       = {Gagnon, Yakir and Söderberg, Bo and Kröger, Ronald},
  issn         = {1084-7529},
  language     = {eng},
  number       = {9},
  pages        = {1786--1793},
  publisher    = {Optical Society of America},
  series       = {Journal of the Optical Society of America A},
  title        = {Optical advantages and function of multifocal spherical fish lenses},
  url          = {http://dx.doi.org/10.1364/JOSAA.29.001786},
  volume       = {29},
  year         = {2012},
}