@ mp3chan - yes, I remember reading that. If you can keep your eyes at a certain focus, a standard 2d screen will be able to produce 3d images!!!
@ MachineHead - It’s supposed to be very good exercise for your eyes. It’s even been recommended for computer users. As computer users look at the screen for long periods of time, there eyes start getting used to a certain focus, so when they try focusing on something else, it may take a second to get the focus right! Over-time the time it takes to get the focus right will start to increase, which could cause sight problems.
This is why Stereo Images can help avoid this, as you are changing/exercising your eye focus!
You can read more about it in the link I provided on the first post!
[EDIT - I think you are supposed to manually change your eye focus without pressing your nose on the screen

. Just try looking through the screen or looking at the space between the screen and your head

]