Change search
ReferencesLink to record
Permanent link

Direct link
The pupils and optical systems of gecko eyes
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0002-4894-7944
Show others and affiliations
2009 (English)In: Journal of Vision, ISSN 1534-7362, Vol. 9, no 3Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 9, no 3
Keyword [en]
gecko, vision, optical system, photorefractometry, Hartmann-Shack, wavefront sensor, color-vision, gekko-gekko, aberrations, light, photoreceptors, absorption, sensor, lenses, image
URN: urn:nbn:se:kth:diva-18543DOI: 10.1167/9.3.27ISI: 000267287800027ScopusID: 2-s2.0-64549098632OAI: diva2:336590
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-17Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Lundström, LindaUnsbo, Peter
By organisation
Biomedical and X-ray Physics
In the same journal
Journal of Vision

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 33 hits
ReferencesLink to record
Permanent link

Direct link