Prison Glasses:

Yep, we've still got some. These were the types of specs worn by inmates in penitentiaries throughout the USA starting in the mid 1960's. The reason these were issued is because inmates couldn't SHANK each other with them, as there are no metal rods inside the temples. Also, these specs were manufactured out of flexible yet durable nylon instead of acetate. They came in black and brown. We can put Rx lenses and/or tints in them too. Blammo.