I call BS on that. Your eyes are slaved to each other. If you see very different things with each eye for any length of time, you get sore eyes and start to get serious eye fatigue. You can, however, train yourself to watch one eye then the other rapidly. Set up pool balls so you can find your blindspot, and be aware of it. Practise crossing your eyes. Get to work looking at autostereograms, stereograms and then try cheating at the "spot the difference" competitions. Learn to pull one eye as the one you are paying attention too, then switch for the other one. And learn to drive with one eye shut - the lack of depth perception makes it rather fun! Then switch eyes. :-) If you want to get really OTT, get some of the contacts that block the fovea centralis, so you cannot see anything out of the highest resolution part of your eye. After 10 seconds of that, you'll have a sore head. After ten minutes, you'll feel sick. After 10 days... You'll have the kind of perception that no-one outside "Heros" has. You can even get a set of mirrors and turn your world upside down. Your eyes actually show everything to your brain the wrong way up, but the brain learns to reverse it. After about 3 to 5 days, your brain will re-reverse things for you.