Originally Posted by mmonnin
The study needs to link this data to how blind people lose their circadian cycle.
How/why someone loses their eyesight determines whether or not they can maintain "normal" circadian rhythms. One of the key mechanisms that entrains circadian rhythms is related to ipRGC (intrinsically photosensitive Retinal Ganglion Cells). These are cells in the retina that respond to light exposure (predominantly sensitive to cyan light at about 480-490nm). IpRGCs don't contribute to visual perception, but have a major impact on our circadian rhythms.
IpRGCs are also why there has been so much press lately about blue light hazards. I don't think its a coincidence that the 2014 Nobel Prize in Physics went to the pioneers of blue LEDs was closely followed by this NP related to biological clocks. The intervening years have been filled with press articles about blue light interfering with biological clocks.
Unfortunately the AMA's position statement on blue light hazards associated with LED lighting was filled with so much bad/incorrect science that it did little more than create a lot of bad press and slow the adoption of proven energy saving technology. Only an association of doctors could blame the lighting industry for improperly administering a drug (blue light) when they themselves couldn't even be bothered to define blue light or say what a correct and proper schedule/dosage would be. . .