Prince William lost his public speaking nerves thanks to his deteriorating eyesight.
The 37-year-old future king admitted he used to experience a "bit of anxiety" ahead of having to address a crowded room, but when he was unable to distinguish faces because of his poor vision, he felt more confident as he didn't feel under so much scrutiny.
He said: "You're like, 'This has to go right. I don't want to mess this up'. There's a lot of people watching and you can see certain people.
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"My eyesight started to sort of tail off a little bit as I got older, and I didn't used to wear contacts when I was working, so actually when I gave speeches I couldn't see anyone's face.