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photopigment

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photopigment /pho·to·pig·ment/ (fo″to-pig´ment) a pigment that is unstable in the presence of light.
photopigment 
Any pigment, such as the visual pigment found in the photoreceptors of the retina, which is altered by the absorption of light energy. See visual pigment; rhodopsin.
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When we blocked the function of ME-ller cells, the retinal visual pathway could not function because cones ran out of photopigment and could not adapt to dark, Kefalov says.
Mechanism that helps us see in bright and low light discovered by Asian News International
In the vertebrate neural retina, light sensitivity is multi-factorial and depends on the properties of photopigment molecules, their synthesis and incorporation into photoreceptor membranes and the neuronal circuitry between photoreceptor, bipolar and ganglion neurons.
Stereology and some structural correlates of retinal and ... by Mayhew, Terry M. / Image Analysis and Stereology
In contrast, exposure to bright light significantly reduced retinal light sensitivity of Pacific halibut, predominately by affecting the photopigment which absorbs the green wavelengths of light (-520-580 nm) most strongly.
Effects of rapid decompression and exposure to bright light on visual ... by Brill, Richard; Magel, Christopher; Davis, Michael; Hannah, Robert; Rankin, Polly / Fishery Bulletin
 
 
 
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