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View of Daysimeter-S and a subject wearing the device. The monolithic accelerometer is located on the same circuit board as the optical sensor array which, when worn, is located at or near the plane of the cornea. This circuit board is connected by a shielded wire to a second circuit board encased in a control module which contains the coin-cell battery, the memory chip, a microcontroller, and a USB interface for communicating with this version of the Daysimeter.
