We've seen smartphones work as electrocardiograms, so why not use them to test for glaucoma at home? That's the idea behind Cambridge Consultants' Viewi headset. Rather than hitting the hospital or optometrist's to monitor your vision, you could simply slide your phone into a head-mounted Gear VR-like holster. From there, a mobile app reproduces the flashing light patterns used to test for open-angle glaucoma. A Bluetooth remote acts as the input device for patients to press when they see a flashing light and, really, that's about it, according to the press release.