So... these exist.
Appropriately named "Mickey Shades", these sunglasses embody Disney's Mickey Mouse in one form and blind mouse (of the three famed) in another... seriously, those disks are called "lens covers". Why you would ever require covers for your lenses whilst they're on your face is beyond me. The creator, Jeremy Scott, is known for his eccentric designs, but the sole purpose of glasses, sun or otherwise, is to aid in your ability to see. Completely obscuring your vision seems counterintuitive to me, but maybe that's his point... subverting your constructed expectations and causing you to reevaluate the true essence of eyewear.
Sorry, grad school flashback.
The only realistic use for such a feature is if you're trying to take a covert nap in public, otherwise they're just a $510 safety hazard.