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The pupils and optical systems of gecko eyes

Roth, Lina LU ; Lundström, Linda; Kelber, Almut LU ; Kröger, Ronald LU and Unsbo, Peter (2009) In Journal of Vision 9(3). p.1-27
Abstract
The nocturnal helmet gecko, Tarentola chazaliae, discriminates colors in dim moonlight when humans are color blind. The

sensitivity of the helmet gecko eye has been calculated to be 350 times higher than human cone vision at the color vision

threshold. The optics and the large cones of the gecko are important reasons why they can use color vision at low light

intensities. Using photorefractometry and an adapted laboratory Hartmann–Shack wavefront sensor of high resolution,

we also show that the optical system of the helmet gecko has distinct concentric zones of different refractive powers, a

so-called multifocal optical system. The intraspecific variation is large but in most of the individuals... (More)
The nocturnal helmet gecko, Tarentola chazaliae, discriminates colors in dim moonlight when humans are color blind. The

sensitivity of the helmet gecko eye has been calculated to be 350 times higher than human cone vision at the color vision

threshold. The optics and the large cones of the gecko are important reasons why they can use color vision at low light

intensities. Using photorefractometry and an adapted laboratory Hartmann–Shack wavefront sensor of high resolution,

we also show that the optical system of the helmet gecko has distinct concentric zones of different refractive powers, a

so-called multifocal optical system. The intraspecific variation is large but in most of the individuals studied the zones

differed by 15 diopters. This is of the same magnitude as needed to focus light of the wavelength range to which gecko

photoreceptors are most sensitive. We compare the optical system of the helmet gecko to that of the diurnal day gecko,

Phelsuma madagascariensis grandis. The optical system of the day gecko shows no signs of distinct concentric zones and

is thereby monofocal. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
gecko, vision, optical system, photorefractometry, Hartmann–Shack wavefront sensor
in
Journal of Vision
volume
9
issue
3
pages
1 - 27
publisher
Association for Research in Vision and Ophthalmology
external identifiers
  • wos:000267287800027
  • scopus:64549098632
ISSN
1534-7362
DOI
10.1167/9.3.27
language
English
LU publication?
yes
id
607261e1-9998-4a81-b469-c2f4b444fbd4 (old id 1397680)
date added to LUP
2009-05-20 12:50:10
date last changed
2017-07-30 04:10:16
@article{607261e1-9998-4a81-b469-c2f4b444fbd4,
  abstract     = {The nocturnal helmet gecko, Tarentola chazaliae, discriminates colors in dim moonlight when humans are color blind. The<br/><br>
sensitivity of the helmet gecko eye has been calculated to be 350 times higher than human cone vision at the color vision<br/><br>
threshold. The optics and the large cones of the gecko are important reasons why they can use color vision at low light<br/><br>
intensities. Using photorefractometry and an adapted laboratory Hartmann–Shack wavefront sensor of high resolution,<br/><br>
we also show that the optical system of the helmet gecko has distinct concentric zones of different refractive powers, a<br/><br>
so-called multifocal optical system. The intraspecific variation is large but in most of the individuals studied the zones<br/><br>
differed by 15 diopters. This is of the same magnitude as needed to focus light of the wavelength range to which gecko<br/><br>
photoreceptors are most sensitive. We compare the optical system of the helmet gecko to that of the diurnal day gecko,<br/><br>
Phelsuma madagascariensis grandis. The optical system of the day gecko shows no signs of distinct concentric zones and<br/><br>
is thereby monofocal.},
  author       = {Roth, Lina and Lundström, Linda and Kelber, Almut and Kröger, Ronald and Unsbo, Peter},
  issn         = {1534-7362},
  keyword      = {gecko,vision,optical system,photorefractometry,Hartmann–Shack wavefront sensor},
  language     = {eng},
  number       = {3},
  pages        = {1--27},
  publisher    = {Association for Research in Vision and Ophthalmology},
  series       = {Journal of Vision},
  title        = {The pupils and optical systems of gecko eyes},
  url          = {http://dx.doi.org/10.1167/9.3.27},
  volume       = {9},
  year         = {2009},
}