Study on the Mechanisms Associated with Dark Circles.

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  • “くま”発生要因に関する研究
  • クマ ハッセイ ヨウイン ニ カンスル ケンキュウ

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The factors that are conventionally suggested as being responsible for the dark circles around the eyes include the retention of blood and poor circulation. In actual fact, however, reports of measurements of blood flow around the eyelid are scarce, and the literature is silent on research into any direct relationship between dark circles and the kinetics of blood flow. In the present work, we used a laser Doppler flowmeter and depthprobe to measure at four different depths, the hemodynamic parameters of blood flow (Flow), mass (Mass), and velocity (Vel.), in a bid to elucidate the circulatory kinetics at the site of formation of dark circles. We also sought to shed more light on the phenomenon of dark circles by measuring skin color and skin surface temperature at the same site. In the periphery of the internal canthus, where dark circles are more readily formed, we found that blood mass (Mass) was high and blood velocity (Vel.) was slow at the skin surface, We also demonstrated that the retention of blood, conventionally regarded as occurring at the site of formation of dark circles, can be characterized by greater blood mass (Mass) and slower blood velocity (Vel.). As well, the skin brightness (L*) was low in the periphery of the internal canthus, and was correlated with blood mass (Mass), suggesting that retention of blood in the surface of the skin may be a significant factor in the development of dark circles.

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