So I started thinking about lens color and uses. Since some open frames are so easy to change lenses (half jackets, M frame, etc) that I may just use my slightly worn lens set for yardwork..and this got me thinking on all the color choices. I know some are geared towards outdoor sports, etc..but are most colored lenses just for fashion, or are their true purposes for each tint/type? I tried searching for a chart with explanations but could not find any. Anyone have a handy link?