The best sunnies that my old man has come across in his 30years of gliding are Eagle Eyes:
Eagle Eyes High Performance Eyewear with the brown tint. EXCELLENT for cloud definition. Though looking at their website, the designs look pretty radical (read little odd!) compared to the originals.
I fly with the boring old Serengetties with the rose tint. I find them too excellent for cloud definition.
go_soaring! instead