Have you thought about Pitts Sunglasses?
JAR & FAA PILOT MEDICALS LONDON
Designed by a consultant ophthalmic surgeon and AME, who is a medical adviser in ophthalmology to the Civil Aviation Authority. Dr John Pitts. So they do the job right!
and at a decent price tag
Cannot speak highly of the glasses having used a pair on diabetes polar flight last april.
Diabetes Polar Flight, flying and diabetes research
:-)