These are the very same prescription sunglasses that I wear myself. I have mine in several pairs including Randolph Aviator prescription frames, Randolph Concorde prescription frames and AO American Optical Original Pilot prescription frames.
While we are offering them in 3 basic tints, other tints including graident tints, are available.
These prescription glass lenses are slightly heavier than CR-39 lenses but if you take good care of them they should last for many years.
If you require additional help, or have more questions, please contact me and I am sure I can assist you.
Prescription Aviator Sunglasses Mineral Glass Lenses