Smart glasses (or smartglasses, the industry can’t make up its mind on how to refer to them) are wearable computer glasses that add information alongside or in front of what the wearer is looking at. I believe we will have consumer quality (not obnoxious attention calling, geeky looking) augmented reality glasses, smart glasses, by 2020. But it’s not going to be easy getting there, which is why some of my friends (well, they’re my friends now) have bets with me on the date. Augmented reality places much heavier demands on the display than does VR. Wide range illumination. An augmented reality display has to work in low light indoors (and not blind you), and in bright light outdoors (and be clearly seen). In fact, in the taxonomy of augmented reality (which includes everything from HUDs to helmets, to smart glasses), there is the differentiation of indoors vs outdoors. We could call this high-dynamic illumination HDI to be differentiated from high-dynamic range (HDR) which is about contrast. [1] Positional accuracy. If your augmented reality glasses are calling your attention to a coffee shop, the sign or logo of that coffee shop needs to be in close proximity to its actual location. That means the logo/sign has to float within the image as you move your head, which you do a lot walking, or driving. In simpler smart glasses, the images are basic directions (left arrow, right arrow, etc., and a bit of text), and the image area stays fixed (typically in in the left or right edge of the glasses). Addressable occlusion. When that coffee shop logo pops up, can you see through it, or is it opaque? That’s known as addressable occlusion, where the augmented image from the image generator has a synchronous and geometric correlation to a segmented part (or parts) of the image on display which blocks out light directly behind the augmented imagery. Otherwise the image is ghosted (semi-transparent). Think about Pokémon—those characters are opaque, whereas text could be semi-transparent so as to not obstruct your view (think of a HUD in a car’s wind shield). For more details : Healthcare System Video