Absorption of white light in photoreceptors
Vision Research, ISSN: 0042-6989, Vol: 38, Issue: 2, Page: 195-207
1998
- 166Citations
- 129Captures
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Metrics Details
- Citations166
- Citation Indexes166
- 166
- CrossRef140
- Captures129
- Readers129
- 129
Article Description
The fraction F of incident light absorbed by a photoreceptor of length l has traditionally been given by F =1 -e−kl, where k is the absorption coefficient of the photoreceptor. Unfortunately, this widely-used expression is incorrect for absorption of the type of light most common in natural scenes—broad spectrum “white” light—and significantly over-estimates absorption. This is because the measured values of k are only valid at the absorbance peak wavelength of rhodopsin, whereas at other wavelengths (which the eye may also see) k is lower. We have accounted for the wavelength dependence of k and calculated the absorption of white light from four different natural radiant sources: the quantal irradiances of natural daylight and a patch of very blue sky, and the quantal reflections of soil and green foliage irradiated by natural daylight. Based on these results, a simple averaged correction for white light stimulation is derived, F = kl /(2.3 + kl ), which is valid for a wide range of k and l, and therefore applicable to both vertebrate and invertebrate photoreceptors.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S004269899700151X; http://dx.doi.org/10.1016/s0042-6989(97)00151-x; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0031986348&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/9536349; https://linkinghub.elsevier.com/retrieve/pii/S004269899700151X; http://linkinghub.elsevier.com/retrieve/pii/S004269899700151X; http://api.elsevier.com/content/article/PII:S004269899700151X?httpAccept=text/xml; http://api.elsevier.com/content/article/PII:S004269899700151X?httpAccept=text/plain; http://dx.doi.org/10.1016/s0042-6989%2897%2900151-x; https://dx.doi.org/10.1016/s0042-6989%2897%2900151-x
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