Accommodation and convergence play critical roles in the natural viewing of
three-dimensional (3D) scenes, and these must be accurately matched to avoid visual fatigue.
However, conventional stereoscopic head-mounted displays lack the ability to adjust accommodation
cues. This is because they only have a single, fixed image plane, but the 3D virtual objects
generated by a pair of stereoscopic images are displayed at different depths, either in front or
behind the focal plane. Therefore, in order to view objects clearly, the eyes are forced to converge
on those objects while maintaining accommodation fixed on the image plane. By employing freeform
optical surfaces, we design a lightweight and wearable spatial-multiplexed dual focal-plane
head-mounted display. This display can adjust the accommodation cue in accordance with the
convergence cue as well as generate the retinal blur cue. The system has great potential
applications in both scientific research and commercial market.
© 2013 Chinese Optics Letters
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