This Contact Lens Puts a Display Right On Your Eye, article.
OK, this I don't get. 'Cuz the eye can't focus on its own surface. Hold text a foot from your eye, you can probably read it. Hold it a couple inches from your eye, you probably can't. Hold it a millimetre from your eye, and you really can't read it.
One solution would be if there were a super-tiny projector to actually project onto the retina with micro-laser beams (somehow taking the light-bending of the lens into consideration). But such compact technology is at least a couple decades away, I'd think.