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 > <stereoCamera>
You have now selected your stereo camera for rendering
- To view your render output in other stereo modes select Display > Stereo Display