Well, my main problem with VR is that you have a screen several centimeters away from your eyes. That means headaches and nausea. I've heard rumours of a devise that simply adjusts semi-transparent filters for different hue, brightness and clolours, and has an automatic light source behind it. The idea being that if you are in an area of natural light, you use much less batteries, and don't get a headache. The problem is, natural sources of light are not often consistently spread, meaning that you either have a terrible looking game, or just a standard headache (if you use the light source). I like the idea of projecting something onto your iris, but it would be too hard to position, and if something was done wrong, it's too easy to do permanent damage to your eyes.