Nosign
I have never been comfortable using plastic lenses;
Contrary to the CASA comment about polycarbonate lenses and scratching, the surface hardening of polycarbonate lens makes them more scratch resistant than the optical glass used in RayBan and similar. This is not true of the many crap "plastic" lens around.
The greater proportion of all glasses sold are now CR-8 or similar, "glass" glasses are becoming a smaller and smaller part of sales.
Whatever your choice, look very carefully at the way lens are retained, are they positively retained, or just sitting in grooves in the frame?
To see an eyeball that has been bisected by the edge of a displaced lens, after a relatively minor frontal impact (victim remained conscious, no concussion, only major injury loss of one eye) was not a pretty sight ---- quite apart from immediate loss of career.
Most commercial sunglasses transmit far too much light for flying, because the standard is based on some megatrendoid being able to see when driving in a road tunnel, the ASNZ standard assume sunglasses remaining on face, so not mussing up his/her/its coiffure by removing said sunnies.
The CASA 15% recommendation is about the maximum, as well as the minimum.
Tootle pip!!