Strain measurements around the eye during the blink are performed for four human subjects in order to investigate the relationship between the wrinkle formation with aging and the strains by daily motion. In addition to the strain measurement, the moisture content, the flexibility and the elasticity of the skin surface are measured for investigating the skin condition. For observing the wrinkle formed on the facial skin, the replicas of the skin surfaces are also collected. Results show that the relationship between the wrinkle and the strain distribution at the inner corner of the eye is different from that at the corner of the eye. The results indicate that different methods for the corner of the eye and the inner corner of the eye are required for avoiding the wrinkle formation.

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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.

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