Microrelief of the skin using a light transmission method

Area of Science:

• Dermatology and biophysics
• Skin imaging and analysis

Background:

• Skin microrelief changes with age, impacting skin texture and appearance.
• Objective measurement of skin surface topography is crucial for dermatological research and product development.

Purpose of the Study:

• To evaluate the accuracy, sensitivity, and reproducibility of the Skin Visiometer for skin microrelief analysis.
• To investigate age- and sex-related differences in forearm skin microrelief.
• To assess the impact of a hydrating cream on skin microrelief in older females.

Main Methods:

• Utilized the Skin Visiometer, a device measuring light transmission through silicone replicas of skin.
• Calibrated with metal plates to determine instrument precision and sensitivity (10-361 microns).
• Analyzed volar forearm skin replicas from young (20-30) and older (55-65) male and female volunteers, measuring roughness parameters and surface topography.

Main Results:

• The Skin Visiometer demonstrated good precision (10-361 microns) and sensitivity (10-20 microns).
• Younger individuals exhibited significantly lower roughness (Rz, Rm, Rt) and a more structured microrelief (higher line counts and intersections) compared to older individuals.
• Diurnal rhythm, humidity, and forearm position influenced measurements; temperature and pre-cleansing did not.
• Hydrating cream application in older females reduced roughness parameters and increased other microrelief features, mimicking younger skin.

Conclusions:

• The Skin Visiometer is a reliable tool for quantifying skin microrelief and its changes.
• Significant age-related differences in skin microrelief are quantifiable.
• Topical hydration can effectively modify skin microrelief towards a younger-appearing state.