I've had amblyopia since birth, supposedly had physical surgery on the eye when I was really young where they shortened the muscle. The ONLY time I've ever had depth perception is actually the 3DS with the face tracking. I cried when I took a 3D picture and seen what I was missing.  I'm wondering if that's similar to what's going on here, and if that would work. Because honestly I'm so sick of not seeing properly I'd probably try snake oil at this point. My lens prescription has got so bad my lazy eye has gone from a negative number to a positive! Even then I'm dubious that it's actually doing anything as about 80% of my vision comes from my right eye anyway.