In the Menu Bar, click Edit > Preferences, then on the left side of the dialog box, select Camera Preferences.
Eye Separation - Set the distance in millimeters between the left eye and right eye in stereoscopic view.
Zero Parallax Distance - Set the focus point in millimeters in stereoscopic view.
Projection Width - Physical projection width in millimeters.
Projection Height - Physical projection height in millimeters.
Projection Distance - Distance between projection plane and observer in millimeters.