My Cardboard app doesn\'t have stereoscopic effect on device. However it works in Editor.
This is how it looks in Editor. http://i.stack.imgur.com/sN14x.png
This
It's spreading one eye across both halves of the screen. The most common reason is due to rendering image effects (fog, etc). To deal with those, make sure the StereoController property "Direct Render" is set to false.