Virtual reality, we're constantly told, will revolutionize how we go about our daily lives, ski-goggle headsets permanently strapped onto our faces. Soon, immersive 360-degree games and films will be nothing but unremarkable. And as that smug conference photofrom February suggested, Mark Zuckerberg will presumably wield full control over our most insignificant thoughts and feelings.But maybe I should take back my snark, because portable headsets may have the potential to help treat certain mental illnesses. At this stage, in the UK at least, we don't know fully how effective "virtual reality therapy" really is, but we may not be far off from seeing it in National Health Service (NHS) clinics around the country.

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