STRESS INTENSITY COMPUTING METHOD AND STRESS INTENSITY COMPUTING APPARATUS

PROBLEM TO BE SOLVED: To provide a stress intensity computing method and a stress intensity computing apparatus capable of computing the stress intensity easily, accurately and in a short time without applying burdens to a subject. SOLUTION: The stress intensity computing apparatus comprises a light source 2 for irradiating the anterior ocular segment A with flash light; an imaging device 4 for imaging the anterior ocular segment A, an iris/pupil diameter computing part 11 for computing the iris diameter Di and the pupil diameter Dp based on the image of the anterior ocular segment A captured by the imaging device 4; and a stress intensity computing part 13 for computing the stress intensity α from the ratio of the pupil diameter Dp to the iris diameter Di. The stress intensity computing part 13 computes the stress intensity α by adding and/or multiplying an initial relative pupil diameter ratio 0 computed from the iris diameter Di and the pupil diameter Dp before the pupil light reaction, the relative pupil minimum diameter ratio 1 of the maximum miosis after the pupil light reaction, and a plurality of relative pupil diameter ratios 2, 3 and 4 after the elapse of a preset period. COPYRIGHT: (C)2008,JPO&INPIT