docet

Key points

• 3D vision relies on good vision in each eye, good coordination between each eye, on movement and image fusion and interpretation of image difference within the brain.
  
• Two to 10% of people have little or no stereo vision, and not always due to reduced vision in one eye.
  
• Autostereo displays, as in ASTEROID, can only simulate 3D when faced directly.
  
• When viewing a digital display simulating 3D, differences in the perceived image distance and the convergence required to view the screen singly induce accommodation and convergence disparities which contribute to eyestrain.
  
• Virtual reality displays may present a different image screen to each eye and incorporate prism to help fusion without convergence. This can induce prismatic effects if the fixation direction alters.
  
• Improved screen resolution and better headset mounting will minimise strain due to accommodation and convergence/prismatic demands.
  
• Only some people are susceptible to eyestrain on 3D viewing.
  
• Most patients suffering eyestrain with 3D display self-regulate their viewing.