This successfully distributes each view to each eye and produces the stereoscopic vision. However on a standard screen only 30 fps would be shown which will produce flickering. This problem can be solved using the new 120 fps monitors that would yield a 60 fps per eye. A more interactive visual display is achieved when the monitors are always in front of the eyes. Tracking devices can be easily integrated to HMDs.
Limited tracking can occur with monitor displays.
So the image becomes larger as the viewer moves closer to the monitor or the image moves to the right when the viewer moves left. However, if users turn their head they can not see the monitor. If viewers turn their head with a properly tracked HMD then the view will be altered to the new perspective. Portable game systems, like Nintendo GameBoy or Sega Game Gear use LCD screens. It is a relatively inexpensive way to provide color to the virtual environment.