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Figure 5 | Journal of Circadian Rhythms

Figure 5

From: Circadian light

Figure 5

Close-up photograph of the Daysimeter. Two light sensors are located near the plane of the cornea, calibrated in terms of their absolute, spatial and spectral response to provide both photopic and circadian light readings. The rear housing attached to the earpiece contains accelerometers for measuring activity as well as memory and control circuitry, all powered by a coin-cell battery.

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