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Wearable Augmented Reality systems are still expensive niche products and not yet widespread. Three main components need to be available for a successful market entry: affordable and user-friendly hardware; reliably and easy to use software and SDKs; and the necessary data structure for exact and informative augmentation. This paper lists some lessons-learned along the road to a wearable AR market.
Buergy et al. (Sun,) studied this question.