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KYOCERA Optical Blood-Flow Sensor Is Among World's Smallest for Wearable Devices, Smartphones. Potential mHealth applications utilize earbuds and other devices to sense stress levels, ...

The device also uses optical flow sensors to track movement against a 2D surface. A button between the forefinger and thumb is used in place of the left-click button on a standard mouse.

Optical flow sensors, which work a bit like optical mice by analyzing frame-to-frame changes in light to detect motion. Laser speckle flow sensors , which track how granular laser reflections ...