I do wonder if paying large amounts of money for branded sunglasses is worth it ?
I use Ray Bans in the 'office', recentley bought a pair of discounted Silouettes (titanium hingless frame, very light) but found they gave me a headache and reduced the contrast of the screens, returned them for a refund.
I have warn cheap sunglasses in my car, of which you can buy numerous types and expensive brand 'lookalikes' for a £1 to £5.
If you visit say 'Wilkinsinsons' they have a large selection for a £1 all certified 100% UV, I have worn a pair of those in my car for a few years and find they give perfect vision.
Wether cheap sunglasses are damaging my eyes is the question, but I suspect they are churned out of the same factories in the far east as many of the leading brands selling for nearer the £100 mark.
I should add I still think Ray Bans lenses are good, and medically proven, and would be reluctant to wear anything else at work.