I recently bought some new ones. This is complicated by the fact I wanted prescription lenses in them. Oakley were expensive as we're the ones below, but not quite as expensive.
They are Adidas glasses and have a small, discrete lens insert. They are comfortable and the optics are superb.
I have the Cobras, on my second pair as I wore the first pair out! Really comfortable (I often wear them all day all week as I work on roofs) and the optics are great, can't go wrong for £40ish
I'm sure they're not up to the standard of Oakley's, but at less than a tenth the price I can afford to lose, break or scratch quite a few pairs before I'm out of pocket.
Both sets include polarising lenses and the yellow/amber lenses are excellent for riding at night, they really help cut down the glare from car head lights, especially those stupidly bright blueish aftermarket lamps and the additional front fog lights that idiots insist on having on all the time.
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I use Polarised lenses for everything but cycling; They seem to "flatten" the trail so roots and ruts aren't so obvious.
Everywhere else though, they make the world a gayer place, particularly with funky coloured french windscreens!
If you need prescription lenses, and want one pair of glasses for all your riding needs, just like I do, then I'd recommend looking at the range offered by Optilabs].