Аннотация:The relationship between the wrinkle formation with aging and the strains by daily motion is investigated by measuring the strains of the facial skin surface for several human subjects. A digital image correlation technique based on a stereovision is used for measuring the strains of the facial skin. Results of the strain measurement show that the strains tend to be concentrated in the common place of facial skin for all human subjects. On the other hand, the different distributions of the principal direction are observed for different aged human subjects. It is also observed that the relationship between the strain and the skin surface morphology at the corner of the eye is different from that under the eye. Results of the strain measurement for various skin conditions show that the strain occurs locally under dry skin conditions whereas strain occurs uniformly under moisture skin conditions. Therefore, it is expected that skin surface morphology can be improved by moisture retention.
