In my last model : https://sketchfab.com/models/45817873aa96410aa83ad64faff7e034
I have a problem between glasses and the ophthalmic frame of this pair of glasses.
As we see in the picture below , the ophthalmic frame is reflected in the glasses and delete the refraction effect .
I tried many possibilities without success with this downloadable model https://sketchfab.com/models/e6fd7cd085ab4530ae3b4e1ad5b1350b .
Thank you for your help !