Avegant’s head-mounted virtual retinal display offers brilliant definition, Engadget goes hands-on (video at source)
“There’s no screen inside, though your brain interprets the signal as an 80-inch panel viewed from eight feet away. The effect isn’t entirely dissimilar to what you’ll find with other products, such as Vuzix’s Wrap glasses or Sony’s HMZ, though the quality – and the overall experience – blows everything else out of the water.”
Since there are no actual screens involved, I’d agree with the article that experiencing it in the flesh is the only proper way to evaluate this kind of tech.
The whole article is at Engadget, along with a video: http://www.engadget.com/2013/10/09/avegant-retinal-hmd/