Novel Method of Remotely Monitoring the Face-Device Distance and Face Illuminance Using Mobile Devices: A Pilot Study

Figure 5

Illuminance measurements as a function of light meter readings. The dotted line in (a) shows the fitting straight line with a slope of 0.292. Bland-Altman plot in (b) shows the same measurement results but rescaled after using the slope value. Black line in (b) represents the mean value and grey lines the 5^th and 95^th percentiles of the difference distributions.

(a)

(b)