That Old-Time Hucksterism: The Oddest Doohickeys of Industrial-Age Entrepreneurs (collectorsweekly.com)

Looks like there's also a metal one with a sweet carrying case (still not slivery though) --http://a.co/6yuAmGR

The funniest thing on that page is the "Frequently bought together" section. A moustache-twirling coffee mug?

I actually had something like this when I was a child. It was a contraption, like a periscope, made of cardboard, that you wore over your eyes (it fit over my glasses) to read while lying down. It worked great. As I recall, I ordered it out of novelty catalog.

They still sell them: https://amazon.com/Prism-Glasses-Eye-Bed-Spectacles/dp/B000R...