I don't know if the below is a true statement because I have never heard it before but it does highlight why even blue light is damaging to vision. Lesson: obtain sunnies with blue light filtering capacity. Take it as high risk that by the time you reach 70 there is a distinct possibility you have some degree of cataract formation and retinal degeneration. The key is to contain the progress of these conditions as much as possible. That can be done but even with the best of care some of us are going to need cataract surgery and may develop AMD. Genes! In particular, a diet specifically addressing the oxidative balance in your blood is very important.
Most importantly control cholesterol, I have seen enough research to indicate that high cholesterol, particularly the small LDL variant (vLDL), readily penetrates the Retinal Pigment Epithelium and thus sets off unwanted cascades of nasties.
http://www.sciencedaily.com/releases/2008/10/081013171431.htm
... The eye is particularly vulnerable to the damaging effects of sunlight. Ultraviolet radiation is absorbed by the lens, but visible or “blue” light penetrates to the retina so allowing us to see. Protection against the harmful effects of blue light is provided by the antioxidant vitamins C and E, the carotenoids (lutein and zeaxanthin) which filter blue light, and zinc. --------
