Cheap Vintage eyeglasses

cheap There is something nice about the translucent lucite and the brushed silver aluminum. They are lite weight and let your face shine through.
These were made by Bausch and Lomb.
4 1/4 - 5 1/2
46 (square) 20

I don't know what all the markings mean. So please let me know if you need mor measurements.
Thanks