your right eye sees the face on right side.
your left eye sees the face on left side..

the brain trys to add both images together, to create one image..on each side of the eye..you know the brain can do and see two images at once..

its just the brain usually is using both eyes, and interperting the image to the brain..focus on the center..and each image on either eye, left or right side, will be added together to form one image...