1993 年 27 巻 3 号 p. 355-373
We measured changes in facial wrinkles and skin texture by aging, sunlight exposure and applicaion of cosmetics.
With a replica photographing system and image analysis, we measured wrinkles for parameters of depth and the ratio of wrinkled area (RWA: showing amount of wrinkles). As for skin texture, we measured depth and distance of furrows, ratio of furrow depth (RFD: showing amount of skin texture) and anisotropy.
As a result of measuring changes in wrinkles due to aging, it was found that the process of wrinkle formation was classified roughly into 2 stages. In the initial stage of wrinkles, RWA incseased greatly in the 30s, due to many fine wrinkles 0.15mm or less in depth. Then, the second stage showed the acceleration in the increase of wrinkle depth which seemed to be caused by a vicious circle in solar elastosis. It was also observed that, compared to the office workers, the outdoor workers showed higher values of RWA in the initial stage and of wrinkle depth in the second stage.
The result of measuring changes of textures revealed that the amount of furrows decreased with aging and morphology after 60s differed from that of natural furrows and resembled to the morphology observed in the initial stage of wrinkles. As for the influence of sunlight exposure, the furrows in the outdoor workers of 30s and 40s became more indistinct in comparison to those of the office workers.
Then, as a result of examining changes in wrinkles by the continuous application of moisturizing lotion and eye cream, relatively small wrinkles below 0.15mm depth decreased in both cases probably due to increase in hydration in the stratum corneum. We thought this effect reduced the degree of vicious circle in solor elastosis and delayed the appearances of deep wrinkles. From these results, it was thought that skin care around the age of 30s, when small wrinkles started to increase, was extremely important to control wrinkle appeararances.