STRESS INTENSITY COMPUTING METHOD AND STRESS INTENSITY COMPUTING APPARATUS

摘要

PPROBLEM 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. PSOLUTION: 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 from the ratio of the pupil diameter Dp to the iris diameter Di. The stress intensity computing part 13 computes the stress intensity 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. PCOPYRIGHT: (C)2008,JPO&INPIT