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from my experience with the dk2 i felt their biggest issues were:

  hard plastic frame,
  eye tracking,
  blood circulation
the hard plastic frame limits the variability of the distance between two pupils. Pupillary distance is ~62mm for women and ~64mm for men(i). With obvious variance even within the sexes. Just hardcoding a distance is a limitation that requires the brain to work harder to massage the inconsistencies causing added strain. ( the images appear to show lenses that are now even unable to be removed, one potential solution i saw was the possibility of buying lens kits for offsetting the lens to your specific pupillary distance )

the lack of eye tracking really disrupts the experience. Look around the place you are in right now, but keep your eyes straight only moving your neck as you move from object to object. The movements are awkward and feel like a retrofuture automaton. Now look around casually and notice how often you utilise the movement of the eyeball. ( unable to tell at this moment if there is any extra hardware in the mask )

as for the blood circulation if i wore the dk2 for more than 20m and took it off to look in the mirror the area around my eyes was white for want of blood and highlighted by the red marks where the mask was pressed against my face. ( the images show the same face pressing frame )

i had many more issues with the dk2, but these three seemed to me to be confirmation proofs that the direction digital stereoscopy is going in is innately flawed

a constructive alternative would be digital stereoscopy that uses eye tracking to measure pupillary distance and the pupils' direction vector in order to create a scene ad hoc, or virtual reality through direct sensory manipulation

(i) http://en.wikipedia.org/wiki/Pupillary_distance



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