Binocular measurement device, binocular measurement method, and binocular measurement program

A binocular measurement device comprising:

• a photodetector configured to detect light from a right eye and a left eye of a target person, and output a detection signal;
• and
• a processor electrically coupled to the photodetector and configured to input the detection signal, wherein
• the processor is configured to:
• calculate a first feature amount corresponding to the right eye and a second feature amount corresponding to the left eye based on the detection signal;
• and
• calculate, based on feature amounts of the first feature amount and the second feature amount, a comparison value obtained by comparing the first feature amount and the second feature amount,
• wherein the processor calculates feature amounts related to involuntary eye movement as the first feature amount and the second feature amount, and
• wherein the processor calculates the feature amounts related to involuntary eye movement by
• (i) calculating a temporal change of an eyeball position movement speed for each of the right eye and the left eye, separately,
• (ii) comparing the temporal change of the eyeball position movement speed for each of the right eye and the left eye with a predetermined threshold,
• (iii) identifying, for each of the right eye and the left eye, separately, a period in which the threshold is exceeded by the temporal change of the eyeball position movement speed as a period of a flick, and a period in which the threshold is not exceeded by the temporal change of the eyeball position movement speed as a period of drift movement and tremor movement, and
• (iv) calculating, for each of the right eye and the left eye, separately, one or more feature amounts of the flick, the drift movement, and the tremor movement, as the feature amount related to involuntary eye movement.