Abstract: A video imaging device obtains the eyeball image of a cornea using light emitted from an imaging light source to the cornea. On the basis of the obtained eyeball image, a video processing device calculates the X- and Y-axis shift amounts and torsion angle of the cornea with respect to the reference position and causes a coordinate indicating device to indicate the calculated X- and Y-axis shift amounts and torsion angle. With this arrangement, the position and torsion angle of the cornea of the patient can be accurately detected and measured without forming any mark on the eyeball to measure the position of the cornea, and the measured position and torsion angle of the cornea can be indicated.

Abstract: A video imaging device obtains the eyeball image of a cornea using light emitted from an imaging light source to the cornea. On the basis of the obtained eyeball image, a video processing device calculates the X- and Y-axis shift amounts and torsion angle of the cornea with respect to the reference position and causes a coordinate indicating device to indicate the calculated X- and Y-axis shift amounts and torsion angle. With this arrangement, the position and torsion angle of the cornea of the patient can be accurately detected and measured without forming any mark on the eyeball to measure the position of the cornea, and the measured position and torsion angle of the cornea can be indicated.