Average ( D) sharpness ratings and ( E) fusibility for Maltese cross targets are shown for each of four distances: 1–4 D. ( D and E) The system from B was used to test whether common refractive errors could quickly be measured and corrected for in an adaptive focus display. ( C) Histogram of user ages from our main studies. A translation stage adjusts intereye separation, and NIR/visible light beam splitters allow for simultaneous stimulus presentation and accommodation measurement. ( B) A benchtop setup designed to incorporate adaptive focus via focus-tunable lenses and an autorefractor to record accommodation. Adaptive focus can be implemented using either a focus-tunable lens (green arrows) or a fixed focus lens and a mechanically actuated display (red arrows), so that the virtual image can be moved to different distances. The focal length of the lens, f, and the distance to the microdisplay, d ′, determine the distance of the virtual image, d.
( A) A typical near-eye display uses a fixed focus lens to show a magnified virtual image of a microdisplay to each eye (the eyes cannot accommodate at the very near microdisplay’s physical distance). Indeed, the opportunities afforded by recent advances in computational optics open up the possibility of creating a computing platform in which some users may experience better quality vision in the virtual world than in the real one.įig. By using focus-tunable lenses, mechanically actuated displays, and mobile gaze-tracking technology, these displays can be tailored to correct common refractive errors and provide natural focus cues by dynamically updating the system based on where a user looks in a virtual scene. With two prototype near-eye displays, we show how these issues can be overcome using display modes that adapt to the user via computational optics. Current displays cannot reproduce the changes in focus that accompany natural vision, and they cannot support users with uncorrected refractive errors. At their core, many of the issues with near-eye displays are caused by limitations in conventional optics.
However, current generation near-eye displays suffer from multiple limitations: they are unable to provide fully natural visual cues and comfortable viewing experiences for all users.
The primary interface between a wearable computer and a user is often a near-eye display. Moving forward, wearable computing is widely expected to be integral to consumer electronics and beyond. From the desktop to the laptop to the mobile device, personal computing platforms evolve over time.
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