Focus shouldn't be much too much of an issue until the displays are much higher resolution. The push for very high resolutions by smartphones has made this product possible at a low price. One or two display makers recently showed a a prototype of a screen with double the linear resolution of the one used in the Oculus. Beyond that, it may take a long while for even higher resolutions.

When you adjust the focusing lens in this headset, the apparent distance of the screen will be an infinite distance, not centimeteres. With the low resolution of the screen and the small size of human pupils, there shouldn't be any problems with the focus point being different than the convergence point, except perhaps when an object is simulated as being centimeters from your face.

I have more issues with DRM when it restricts my hardware choices, such as DRM for audio, video and books. That DRM limits which devices the media can be used with, such as when iTunes music was limited to iPods and Mac/Windows. On the other hand, I can run Steam on any device that can run the game. For me, the advantages of Steam outweigh the disadvantages of its DRM, except when it comes to the one movie on the service. I won't be buying Indiegame the Movie on Steam, because it restricts my viewing options.

OS X renders fonts more accurately with the trade-off of less sharpness. The sharpness trade-off doesn't matter as much when you double the PPI.

You can set the desktop size to be equivalent to a non-pixel-doubled 1920x1200. It renders the image internally at 3840x2400, then scales it down to the native resolution. Not as good as physically being output at 3840x2400, but it may still look better than native 1920x1200.

They also improved the screen technology to IPS. If it has a similar color gamut to the new iPad, which is almost exactly sRGB, then it is on par with Apple's Cinema Display. Even when not considering resolution (or size), the display should be better than 98% of desktop displays.

Perhaps the reason a desktop display should be 3 feet from your eyes is because the PPI is so low? I don't see why you shouldn't use a desktop monitor at 18-24". I use a Cintiq (Wacom pen enabled display) at work, and the pixels on it are huge at normal working distance. Any screen you can interact with directly through touch or a digitizing pen can easily benefit from a 200+ PPI screen.

From NPR:

The 74,000 backers are obviously just buying the game for their kids.

"The biggest problem with 3D, though, is the "convergence/focus" issue."

Our eyes have quite a small aperture. Focusing beyond 15 feet or so will always give a circle of confusion that is smaller than the size of the smallest detail in a projected film picture.

Even at closer distances, if the simulated depth is reasonable, it shouldn't cause too many issues.

And my favorite, a built in power supply that uses the same power cord as most desktops (original PS3) or notebooks (slim PS3). Despite being larger than the Wii, it is a lot more portable.

Most Automobiles share the same road system. iOS apps only have to be designed for a very limited number of systems.

It only needs to tracking the location of the eyes, not their gaze.
http://www.youtube.com/watch?v=OOy-Dnr3xyU&feature=player_detailpage#t=87s

Between 20 feet and infinity, the difference between focus is practically nil.
It may be more of a problem on a smaller screen, though.

Further than 25 ft, focus distance doesn't make much difference, especially at the resolution of most film. That's probably why Snellen eye charts are placed 20 feet away.

For me, I don't think the biggest problem with 3D displays is the stereoscopy, rather all the tricks used to achieve it at a relatively low price. I get eye strain watching a 2D trailer (while wearing 3D glasses) before a 3D movie just because the picture alternates between images for each eye. I think Sony projectors show both images simultaneously, but there are none of those near me.

I actually find red-cyan glasses easier to use for a very short period of time, because the video is smooth, but the color difference leads to worse headaches in the long run. I'll probably be able to handle the 3D on the 3DS.

That's because most of the dialog for that part came out of Mark Zuckerburg's LiveJournal.
http://www.scribd.com/doc/538697/Mark-Zuckerbergs-Online-Diary

They sensationalized the beginning part of the blogging, though. In the movie he didn't use a comment tag, and he went off about cup sizes.

<p><i>8:13pm</i>.<!- - Jessica Alona is a bitch. I need to think of something to make
to take
my mind off her.- - >I need to think of something to occupy my mind. Easy enough
now I just need an idea...