Strategy Analytics expects the market for smartphone plus standalone virtual reality headsets (excluding PC and game console-based VR heasets) to expand dramatically in the next 6 years. We forecast the market wll be worth US$6.9B annually by 2022, reaching an installed base of some 459 million units by that time. Smartphone-based VR represents a key on-ramp to VR for the masses, and will account for the majority of shipments and users. However, highly immersive yet autonomous standalone VR units are the holy grail. This report sizes the market through 2022 in terms of shipments, revenues and installed base for both device classes.