Re UV coatings, I think that's distinct from anti-reflective coatings, a cheaper form of which produce the very striking blue reflection that some people find fashionable. Re cataracts, I've often heard of a link between UV exposure and cataracts. But like everything I found it's more complex... I developed a condition where as the eyeball changes shape due to elongation from muscle strain of strong distance correction for near field viewing (eg computer displays) the jelly in the eye separates from the retina and creates a horrible crippling form of floaters. For aging suffers of diabetic retinopathy (my late father) there's a treatment of replacing the vitreous jelly with saline and this can cure the problem as a nice side effect of the treatment. But it's been found that vitreous jelly has a critical effect inhibiting cataracts, and that you are guaranteed to require lens replacement within 5 years after a vitrectomy. The Doc said there is some science that suggests that its oxygen impermeability of the jelly, or rather it's permeability, that's crucial to the onset of the disease. Wonders...