You've probably heard more about the perils of blue light lately because our lives are more likely to be lived indoors and online. Our laptops, phones, tablets, TVs and even LED light bulbs are all sources of blue light. And now that we're tethered to those devices, are we getting drenched? Should we be more worried about damage to our skin?

This is what we know: Compared with the well-understood dangers of ultraviolet light (skin ageing and cancer), science isn't settled on the effects of indoor sources of blue light on skin. It can cause hyperpigmentation and premature ageing, but the rest — what dose of it causes trouble, for instance — was debated well before we were confined to our homes.