"At age 40, only half the light gets through to the retina as it did at age 20. For 60-year-olds, it’s just 20%." http://bit.ly/qUFSUk
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"At age 40, only half the light gets through to the retina as it did at age 20. For 60-year-olds, it’s just 20%." http://bit.ly/qUFSUk