On the 13th floot of a building in the middle of Manhattan, an eye surgeon wearing a head tracker steps inside a three-dimensional image of a patients retina projected onto the wails of a virtual-reality Cue. "We construct the 3D image from slices taken with an optical coherence tomography (OCT) scanner," explains Luis Gratia, assistant imaging technology engineer at the Weill Cornell Medical College. "[The surgeon] can find things by scrolling through the slices on his desktop, but the Cave is just two flights up the stairs from his office, and in the Cave, he can see everything in rive seconds."
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