Trying to work out what they're for. There's some blue mirrored ones- these are for looking cool, even when wearing a helmet. There's some clear colourless ones. Fine: the blue ones aren't much cop when it's dark. But they look shoot because you can see the prescription inserts through them. There's some clear yellow ones too. What are they for? I tried looking out the window with them this morning, no obvious advantage except they made it look as if Watford had 1970s LA-style photochemical smog.