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Sun Damage Through a Window

We know that our skin is harmed when directly exposed to the sun’s ultraviolet (UV) radiation for too long. Studies have reported clinical observations of prolonged UV exposure leading to underlying differences in skin physiology and morphology. But what about indirect skin cancer risks, such as repeated ultraviolet-A (UVA) exposure through a window?

A study enrolled eight women and two men who presented with asymmetrical signs of photoaging due to overexposure to the sun on just one side of their face, through a window, over a long period of time. Split-face biometrologic assessments were performed, including: clinical scoring, hydration with Corneometer®, mechanical properties with Cutometer®, transepidermal water loss with AquaFlux®, skin relief with fringe projection, photography, stripping, and then lipid peroxidation analysis.

Significant differences were observed in clinical scores for wrinkles, skin roughness assessed by fringe projection on the cheek, and skin heterogeneity assessed with spectrocolorimetry on the cheekbone. Other differences were observed for skin hydration and skin laxity.

The study therefore found that indirect exposure to the sun through a window can be harmful to the skin, even though we typically believe direct UV exposure to be the cause of sun damage. It determined that there is a potential benefit in using daily sun protection while indoors or near a window, even if the sun exposure is nondeliberate.

Click here to access the full paper 

Source: Clinics interventions in Ageing
Authors: Sophie Mac-Mary, Jean-Marie Sainthillier, Adeline Jeudy, Christelle Sladen, Cara Williams, Mike Bell, and Philippe Humbert

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