Dual (Bifocal) Sunglasses

[Bob Ross]

I'm presuming you're talking about a bifocal sunglass where the main/upper lens is not a prescription, correct?
If so, I bought my wife several pairs of Sperian A900 Series Reading Magnifier #A961 (+2.0 Diopter, Black Frame, TSR Gray Lens, Anti-scratch Coating) that she loves for cycling. Allows her to read cue sheets, her cyclometer, menus at post-ride burger joints, etc.

The cool thing is that they can be found for stupid cheap. Search for them on industrial cleaning supply e-commerce sites; I dunno, apparently the janitor at the local high school likes to wear sport glasses? I've never spent more than $20 for them, and have bought them for as little as $7 each!

Contrast that with my unfortunate condition, where I do need a precription main/upper lens (nearsighted + astigmatism) in a ddition to a reading bifocal. I spent 100 times what I paid for her glasses for mine!