In reply to kevin stephens:
Thanks for your response.
I use bifocals to run and cycle; haven't yet tried to climb in them. I will do before pulling the trigger on prescription glacier glasses.
I looked at the sources mentioned above, and for some manufacturers, glasses would cost over €300.
So more research needed and I'll just have to save my pennies in the meantime.
As your thoughts and those of others, are up-to-date, then hopefully this thread will be useful to others.
Thanks !