Everyone knows about fitness trackers that measures your steps and heart rate at some point, but what about your eyesight? That's what EyeQue's Personal Vision Tracker sets out to do with its $30 gadget. What is it? No, it's not a gadget you strap around your eyeball. Instead the EyeQue is a small cylindrical microscope which uses your phone's display and a set of lenses to measure your eye's refractive error to detect nearsightedness, farsightedness, and astigmatism. Once you've performed the test four to six times (about 30 minutes total), you'll receive a set of "EyeGlass Numbers," which can be used pretty…
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