Table 4. Correlation of Mechanical and Optical Skin Properties

The correlation between mechanical and optical properties; the statistical comparison demonstrates there are significant correlations between the skin firmness parameter, R7, and optical properties linked to radiance, such as color and brightness. A negative correlation was found between the viscoelasticity of skin, R6, and skin radiance, characterized by luminance and specular and diffuse reflection. The correlation between elasticity of the skin, R5, and optical parameters was weaker and less significant.