They should also have an ultraviolet element to protect your eyes from uva and uvb rays. These rays can cause cataracts, with uvb rays also potentially leading to macular degeneration.
[header] How to prevent development of cataracts [title] Protect your eyes from the sun. [step] Wear sunglasses and a wide-brimmed hat if you need to be outside. Choose sunglasses that are polarized to reduce eyestrain from glare sensitivity.