Modeling spectral sensitivity at low light levels based on mesopic visual performance

Meri Viikari, Aleksanteri Ekrias, Marjukka Eloholma, Liisa HalonenLighting Laboratory, Helsinki University of Technology, FinlandAbstract: The spectral sensitivity of the eye at low light levels, ie, mesopic conditions, is determined by the rod and cone photoreceptors of the retina operating togethe...

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Autores principales:	Meri Viikari, Aleksanteri Ekrias, Marjukka Eloholma, Liisa Halonen
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2008
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/e9308a3079b74591b074ed9f6eabbd2b
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spelling	oai:doaj.org-article:e9308a3079b74591b074ed9f6eabbd2b2021-12-02T02:13:16ZModeling spectral sensitivity at low light levels based on mesopic visual performance1177-54671177-5483https://doaj.org/article/e9308a3079b74591b074ed9f6eabbd2b2008-03-01T00:00:00Zhttp://www.dovepress.com/modeling-spectral-sensitivity-at-low-light-levels-based-on-mesopic-vis-a367https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Meri Viikari, Aleksanteri Ekrias, Marjukka Eloholma, Liisa HalonenLighting Laboratory, Helsinki University of Technology, FinlandAbstract: The spectral sensitivity of the eye at low light levels, ie, mesopic conditions, is determined by the rod and cone photoreceptors of the retina operating together in varying degree as adaptation luminance shifts between the scotopic and photopic. Thus mesopic spectral sensitivity is different from photopic, where only cones contribute to vision. There are definite needs for a practical system of mesopic photometry to be used in assessing light at low light levels, especially in road and other outdoor lighting applications. However, neither of the recently proposed systems of mesopic photometry, the MOVE-model or the X-model, is found satisfactory by common consent of the lighting community. The most active debate has considered the upper luminance limit of the mesopic region, which is regarded to be too high for the MOVE-model and too low for the X-model. The present paper proposes a new modified MOVE-model whose upper luminance limit is adjusted to meet the actual road and street lighting luminance values measured in different weather conditions. The paper compares the MOVE-model, X-model, and the proposed modified MOVE-model with three independent visual performance data sets provided by different European universities. Based on the comparison, recommendations are given for future actions towards internationally accepted practice for mesopic photometry.Keywords: spectral sensitivity, mesopic, visual performance, mesopic model, photometry, night-time driving Meri ViikariAleksanteri EkriasMarjukka EloholmaLiisa HalonenDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2008, Iss Issue 1, Pp 173-185 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Meri Viikari Aleksanteri Ekrias Marjukka Eloholma Liisa Halonen Modeling spectral sensitivity at low light levels based on mesopic visual performance
description	Meri Viikari, Aleksanteri Ekrias, Marjukka Eloholma, Liisa HalonenLighting Laboratory, Helsinki University of Technology, FinlandAbstract: The spectral sensitivity of the eye at low light levels, ie, mesopic conditions, is determined by the rod and cone photoreceptors of the retina operating together in varying degree as adaptation luminance shifts between the scotopic and photopic. Thus mesopic spectral sensitivity is different from photopic, where only cones contribute to vision. There are definite needs for a practical system of mesopic photometry to be used in assessing light at low light levels, especially in road and other outdoor lighting applications. However, neither of the recently proposed systems of mesopic photometry, the MOVE-model or the X-model, is found satisfactory by common consent of the lighting community. The most active debate has considered the upper luminance limit of the mesopic region, which is regarded to be too high for the MOVE-model and too low for the X-model. The present paper proposes a new modified MOVE-model whose upper luminance limit is adjusted to meet the actual road and street lighting luminance values measured in different weather conditions. The paper compares the MOVE-model, X-model, and the proposed modified MOVE-model with three independent visual performance data sets provided by different European universities. Based on the comparison, recommendations are given for future actions towards internationally accepted practice for mesopic photometry.Keywords: spectral sensitivity, mesopic, visual performance, mesopic model, photometry, night-time driving
format	article
author	Meri Viikari Aleksanteri Ekrias Marjukka Eloholma Liisa Halonen
author_facet	Meri Viikari Aleksanteri Ekrias Marjukka Eloholma Liisa Halonen
author_sort	Meri Viikari
title	Modeling spectral sensitivity at low light levels based on mesopic visual performance
title_short	Modeling spectral sensitivity at low light levels based on mesopic visual performance
title_full	Modeling spectral sensitivity at low light levels based on mesopic visual performance
title_fullStr	Modeling spectral sensitivity at low light levels based on mesopic visual performance
title_full_unstemmed	Modeling spectral sensitivity at low light levels based on mesopic visual performance
title_sort	modeling spectral sensitivity at low light levels based on mesopic visual performance
publisher	Dove Medical Press
publishDate	2008
url	https://doaj.org/article/e9308a3079b74591b074ed9f6eabbd2b
work_keys_str_mv	AT meriviikari modelingspectralsensitivityatlowlightlevelsbasedonmesopicvisualperformance AT aleksanteriekrias modelingspectralsensitivityatlowlightlevelsbasedonmesopicvisualperformance AT marjukkaeloholma modelingspectralsensitivityatlowlightlevelsbasedonmesopicvisualperformance AT liisahalonen modelingspectralsensitivityatlowlightlevelsbasedonmesopicvisualperformance
_version_	1718402627495002112

Modeling spectral sensitivity at low light levels based on mesopic visual performance

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