HDRS (Hybrid Diffuse Reflectance Spectroscopy)
Description
Current in vivo methods of evaluating SPF and FP-UVA induce cellular damage to the skin of volunteers. HELIOSCIENCE will propose in 2024 a new more ethical method that is currently being standardized at ISO: the HDRS. This is a hybrid method that combines an in vivo test and an in vitro test. The in vivo test is based on diffuse reflectance spectroscopy that uses the skin’s ability to reflect light. Light is radiated into the skin and its backscatter is quantified in different places. This technique offers a unique approach to testing sunscreens on human skin because it uses UV radiation (UVA in particular) at intensities and doses much lower than those that cause cell damage to the skin. The in vitro test measures the absorption of the sun protection product tested on all UVB and UVA domains and takes into account its stability with respect to light.
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