A British man went blind after drinking free whiskey and vodka shots on holiday.

Calum Macdonald, 23, was enjoying a night out in Vang Vieng, Laos, when he was offered the free alcohol last November.

The next day, he realised he was 'engulfed in this blinding white light'.

It wasn't until he asked a friend to 'turn on a light' in their hotel room that he realised it was already on and he could not see.

He told BBC Breakfast: "The point at which I really started to notice some strange side effects was we briefly got off the bus to cross the border into Vietnam and we went through the border office – we had to fill out a number of forms to get across to the other side – and at that point, sort of my entire vision was engulfed in this blinding white light.

"And I just thought, you know

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