Article continues below advertisementRobbie Williams has become the most high-profile warning yet in a growing health debate around celebrity use of weight-loss injections, after revealing fears the drugs could be damaging his eyesight - raising alarms that vanity-driven misuse may put other stars at risk of going blind.OK! can reveal the former "Take That" singer, 51, believes the injectable medication Mounjaro, which he uses for weight loss, has caused his vision to deteriorate to the point where he struggles to see fans during live shows.