FTIR measurements are made at several sites on the face
Many skin properties vary across the face. Differences exist in, for example, moisturization levels, skin barrier function and sebum levels. In addition, products applied to the face do not always spread evenly and are removed at different rates in different areas. Facial mapping of skin properties and topically applied products is, therefore of great value to formulators of skin care products and treatments.
3D facial mapping at TRI uses data collected by a portable Fourier-transform infra-red (FTIR) spectrometer with an optical probe attachment (RemSpec IR Optical probe). The optical probe allows measurements to be made on several sites on panelists’ faces. Portability also means that measurements can be made in preclinical tests and in off-site clinical trials. Newtone have partnered with TRI and created specific algorithms that create images of the 3D distribution of substances detected by the spectroscopic measurements. Color grading systems give a very visual and direct view of the data collected. The images are scientifically accurate, but also ideal for communicating with the public.
3D facial mapping has many potential applications. For example, it could be used to investigate the deposition, diffusion, and retention of topical actives on the face. Actives such as sunscreens, insect repellants, anti-perspirants, make-up, etc. 3D mapping could also be used to measure hydration and moisturization in different skin areas, for instance the scalp, lip, cheeks, forehead etc. Opportunities also exist to use 3D mapping for looking at the long-lasting effects of skin products and their water-proof efficiency. In addition, 3D mapping using spectroscopy is ideally suited to look at sebum distribution on the face and the effects of skin cleansers.
3D Facial Mapping
In this 3D map, the degree of redness denotes the concentration of sunscreen detected on the skin surface by the FTIR. The first image is the control, taken before sunscreen application. The second image shows the sunscreen distribution on the face 15 minutes after application. Note that the distribution is not uniform, with sunscreen protection being lower on the nose, chin and temples. The third image shows the sunscreen distribution after 1 hour. Clearly levels have dropped significantly in some areas.