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… an object of the present invention is to propose an optimum arrangement of the EVF in the image pickup apparatus, which is provided with the EVF and can suppress the deterioration of the operability of the image pickup apparatus provided with the line-of-sight input function.
Canon is using a small image sensor that is positioned on the side of the main display in the EVF and using a diving prism to direct light to this sensor. IR LEDs illuminate your eye for pupil detection and are located around the main EVF display.
The image above shows the path of the IR light being sent to your pupil for detection by the eye control sensor.