- Scotopic vision
Scotopic vision is the
monochromaticvision of the eyein low light. Since cone cellsare nonfunctional in low light, scotopic vision is produced exclusively through rod cellsso therefore there is no color perception. Scotopic vision occurs at luminancelevels of 10-2 to 10-6 cd/m². Mesopic visionoccurs in intermediate lighting conditions ( luminancelevel 10-2 to 1 cd/m²) and is effectively a combination of scotopic and photopic vision. This however gives inaccurate visual acuity and colour discrimination.
In normal light (
luminancelevel 1 to 106 cd/m²), the vision of cone cells dominates and is photopic vision. There is good visual acuity(VA) and colour discrimination.
In scientific literature, one occasionally encounters the term
scotopic luxwhich corresponds to photopic lux, but uses instead the scotopic visibility weighting function. [ [http://books.google.com/books?id=GUVHtJCtM0UC Photobiology: The Science of Light and Life] (2002), Lars Olof Björn, [http://books.google.com/books?id=GUVHtJCtM0UC&pg=PA45&source=gbs_toc_r&cad=0_0&sig=xLVz68xyrQB3DzosDDO9upHfsdU#PPA43,M1 p.43] , ISBN 1402008422]
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