Abstract
We developed a new evaluation system (Shiseido Wrinkle Analyzer 3 D Pro) for the analysis of facial wrinkles. This system enables us to obtain precise three-dimensional information based on the curved shape measurement. Using this system, we can quickly classify the wrinkles at the corner of the eye “crow's feet” into coarse or intermediate wrinkles and fine wrinkles.
Three-dimensional curved shape measurement was performed by laser slit beam scanning which is capable of measuring the configuration of the objects on a noncontact basis using skin surface negative replicas. Parameters were collected for the depth, width, length, area, volume and line/base etc. Analysis was based on the three-dimensional inverse Fourier transform of the power spectrum obtained after filtration of the data from the three-dimensional Fourier transform of three-dimensional coordinate of the replica. One of the advantage of this method is the capability to extract and synthesize the image of the parameter group.
This system was applied for the quantitative analysis of wrinkles in association with aging in 275 skin surface negative replicas of the “crows feet” site in Japanese females ranging in age from 20 and 79 years. Data clearly revealed that the wrinkles could be extracted from the other three-dimensional data. In addition, it was confirmed that most of the coarse of intermediate wrinkle parameters gradually increased with age, while the fine wrinkle parameters increased up to the middle age and decreased thereafter. These results suggest that the formation of coarse or intermediate wrinkles must be caused by different mechanisms than that of fine wrinkles.
