perspective of the HMD allows natural interaction with content and a convenient game-play mechanism See also List of optical head-mounted display manufacturers Computer-mediated reality Eyetap Head-up display (HUD) Lumus-optical Positioning technologies Screenless video Smartglasses Stereoscopy Virtual retinal display References Bibliography Head Mounted Displays: Designing for the user; Melzer and Moffitt; McGraw Hill, 1997. O. Cakmakci and J.P. Rolland. Head-Worn Displays: A Review. IEEE Journal of Display Technology, Vol. 2, No. 3, September 2006.. ! Display technology Emerging technologies Eyewear Mixed reality Multimodal interaction Virtual reality Wearable computers