When rendering out a scene with a stereoscopic
camera, Maya renders out the individual left and right camera images.
The images have to be composited in order to apply the desired stereo
effect.
Open
the Render View window by selecting Window > Rendering
Editors > Render View.
In
the Render View window select Render
> Render ><exampleCamera.exampleCamera>
You have now selected your stereo camera for
rendering
To
view your render output in other stereo modes select Display
> Stereo Display