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Message definition (Dark period )
[[File:Melanopic.png|thumb]]
[[File:Melanopic.png|thumb]]
The intrinsically photosensitive retinal ganglion cells (ipRGCs) controls the secretion of melatonin by the pineal gland. Their sensitivity to light is independent from normal vision, which is mediated by cones and rods in the eyes. The ipRGCs have a peak sensitivity at 480 nm and drops off on both sides.<ref name="cie15" /> During the dark period it is preferable to avoid light altogether, as all light provides some melatonin suppression, but this is not reasonable for most people's lifestyles. Instead, is best to simply avoid as much bright light as possible, and limit light intake to only necessary yellow, orange and red light in order to limit melatonin suppression as much as possible. thumb
光感受性網膜神経節細胞（ipRGC）は、その性質上、松果体によるメラトニンの分泌を制御する。それらの光に対する感度は、目の中の錐体と桿体によって提供される通常の視覚とは独立しています。ipRGCの感度は480nmでピークに達し、両側で低下します。[1]
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