From wikipedia:
"Resolution – HMDs usually mention either the total number of pixels or the number of pixels per degree. Listing the total number of pixels (e.g. 1600×1200 pixels per eye) is borrowed from how the specifications of computer monitors are presented. However, the pixel density, usually specified in pixels per degree or in arcminutes per pixel, is also used to determine visual acuity. 60 pixels/° (1 arcmin/pixel) is usually referred to as eye limiting resolution, above which increased resolution is not noticed by people with normal vision. HMDs typically offer 10 to 20 pixels/°, though advances in micro-displays help increase this number."
I think resolution is really an interesting thing when dealing with hmd's.....it's almost like it needs a new understandable scale like cameras came up with megapixels to deal with resolution. I'm not sure the degrees/arc is really accessible. I wonder what a 320x240 screen would be?
This unit, the cheap one, isn't a direct computer output, you'd have to convert the screen to an analog out, which I've done before on this size of a screen, and it wasn't completely unreadable. It's more about pixels per inch, or arc, not straight resolution. It's not about raw pixels anymore. I might give these glasses a shot in a month or two, maybe the price will fall even more or I can find a pair on ebay.