Anyways, they broke, and I fixed them; they broke again, I fixed them again, until finally there could be no more fixing... so I began to search for a new pair.
Finding a model that was made 10 years ago was impossible, even on eBay, so I researched for a new model - the very best sunglasses for desert driving... and I think I found it so I wanted to share this info with you.
Cebe Cecchinel - a specialist mountaineering sunglass, made for people who hike up glaciers. They are UV Category 4 and basically cut out all glare: the desert looks amazingly beautiful with these glasses on, and you can see every detail!
They cost me 400, down from 820 8 )

A couple of choices in lens colours - I went for the brown lenses: they kill out the blue of the sky but make the red sand dunes REALLY look spectacular. The gray lenses made the blue vibrant (so good for boating) but muted the sand colour.
What sunglasses do you use, and would you recommend them for dune driving?