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Read More:
Circadian rhythm sleep disorders: lessons from the blind
http://www.sciencedirect.com/science/article/pii/S1087079200901473
"As totally blind people cannot perceive the light-dark cycle (the major synchroniser of the circadian pacemaker) their circadian rhythms often "free run" on a cycle slightly longer than 24 h."

Study With Totally Blind People Shows How Light Helps Activate the Brain
http://www.sciencedaily.com/releases/2013/10/131028090408.htm
"Light enhances brain activity during a cognitive task even in some people who are totally blind, according to a study conducted by researchers at the University of Montreal and Boston's Brigham and Women's Hospital."

Circadian rhythm abnormalities in totally blind people: incidence and clinical significance.
http://www.ncbi.nlm.nih.gov/pubmed/1619000
"When people are completely isolated from environmental time cues, their circadian rhythms free run with a nearly 24-h cycle, generated by an internal body clock. Free-running temperature, cortisol, and melatonin rhythms have also been described in totally blind people, even though they were living in normal society and had access to abundant time cues; thus an intact visual system may be essential for synchronization of the circadian system."

Ganglion Cell Layer
http://en.wikipedia.org/wiki/Ganglion_cell_layer
"The ganglion cell layer (ganglionic layer) is a layer of the retina that consists of retinal ganglion cells and displaced amacrine cells."

Watch More:
What Is Circadian Rhythm?
http://testtube.com/dnews/dnews-387-how-your-brains-internal-clock-works
TestTube Wild Card
http://testtube.com/dnews/dnews-437-pets-make-us-healthier?utm_campaign=DNWC&utm_medium=DNews&utm_source=YT
Stem Cells Cure Blindness
http://testtube.com/dnews/dnews-351-stem-cell-treatment-cures-blindness
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