RWC change teams' kit to help colourblind viewers/players

If you've been following this year's Rugby World Cup you may have noticed some interesting new kits that some teams have been sporting. It's to help fans and players alike with colour vision deficiency or CVD - that's colour blindness and the jerseys help them to distinguish between teams. One in 12 males and 1 in 20 females live with it - so to find out more about it, Nathan Rarere asked optometrist with a special interest in CVD, Molly Whittington to explain what it is.