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.
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 ε0 computed from the iris diameter Di and the pupil diameter Dp before the pupil light reaction, the relative pupil minimum diameter ratio ε1 of the maximum miosis after the pupil light reaction, and a plurality of relative pupil diameter ratios ε2, ε3 and ε4 after the elapse of a preset period.
COPYRIGHT: (C)2008,JPO&INPIT
Yunori Kamei
Nobuo Shimazaki
Kazunobu Yokota
Masatoshi Kato
Hiroyuki Maruoka
Iritech Co., Ltd.
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