It is said that an eye reflects the condition of heart in the facial expression. This paper describes the experimental results on behaviors of eyes of a youth and an old age before and after physical exercise or spiritual mind's change. They were evaluated by the power spectral density of temporal radiation temperature distributions of an eye which were appeared in the dynamic thermograms of face by using infrared thermography. In this experiment the authors clarify that dynamic behavior of an eye does not follow the 1/f theory which is adopted in the natural phenomena such as twinkling of stars, murmuring of a stream, and so on.