==See also==* Head-mounted display (HMD)* Head-up display (HUD)* Virtual reality (VR)* Virtual retinal display* VRML==References====Bibliography==* Head Mounted Displays: Designing for the user; Melzer and Moffitt; McGraw Hill, 1997==External links==* HMD/headset/VR-helmet Comparison Chart* User survey of HMD requirements* Resolution analysis for HMD helmets / Comparison Chart* Vision Systems International
ISBN 0-7546-6319-1==Zunanje povezave==*Crown found in the shrine of Saint Simeon in Zara on Sigismundus website*The Canticle of Simeon on the Catholic Encyclopedia.