Cycloduction measurement device, cycloduction measurement method, and cycloduction measurement program

A cycloduction measurement method, comprising:

• acquiring ellipse parameters of a pupil contour by performing ellipse fitting processing on the pupil contour in an eye image of a subject being in a reference state;
• recognizing a position of a predetermined blood vessel in a sclera region in an eye image of the subject acquired when actually measuring cycloduction, and acquiring a first information pertaining to the position of the predetermined blood vessel;
• and
• calculating an angle of cycloduction, on the basis of the first information, a second information pertaining to the position of the predetermined blood vessel in the reference state, and the ellipse parameters of the pupil contour.

A cycloduction measurement program implemented in an information processing apparatus, for causing the information processing apparatus to perform:

• processing of acquiring ellipse parameters of a pupil contour by performing ellipse fitting processing on the pupil contour in an eye image of a subject being in a reference state;
• processing of recognizing a position of a predetermined blood vessel in a sclera region in an eye image of the subject acquired when actually measuring cycloduction, and acquiring a first information pertaining to the position of the predetermined blood vessel;
• and
• processing of calculating an angle of cycloduction, on the basis of the first information, a second information pertaining to the position of the predetermined blood vessel in the reference state, and the ellipse parameters of the pupil contour.