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The aging of your eyes is blamed in circadian rhythm disruption
And could lead to a number of illnesses. The basic issue is that as your eyes age, they filter more blue light, and they've linked this lack of blue light to various problems. Solution? Replacing the lens surgically with one that doesn't filter blue.
There were some very interesting Slashdot comments on people who had their lenses replaced and others who had circadian problems.
http://www.nytimes.com/2012/02/21/health/aging-of-eyes-is-blamed-in-circadian-rhythm-disturbances.html?_r=1
http://science.slashdot.org/story/12/02/21/176250/aging-eyes-blamed-for-seniors-health-woes
There were some very interesting Slashdot comments on people who had their lenses replaced and others who had circadian problems.
http://www.nytimes.com/2012/02/21/health/aging-of-eyes-is-blamed-in-circadian-rhythm-disturbances.html?_r=1
http://science.slashdot.org/story/12/02/21/176250/aging-eyes-blamed-for-seniors-health-woes