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Thad Starner, who has been wearing a "homebrew" computer with a head-up display as part of his daily life since 1993, discusses why it has taken so long for wearables to capture consumer interest. He discusses the various challenges of designing wearable systems and presents five different phases of head-mounted displays, illustrating how improvements in technology allowed progressively more useful and usable devices.
Thad Starner (Wed,) studied this question.