A British backpacker left blind after drinking tainted alcohol which killed six fellow tourists in Laos has spoken out about his ordeal for the first time.

Calum Macdonald, 23, survived a mass poisoning at the Nana Backpacker Hostel in the southeast Asian country’s popular destination of Vang Vieng last November.

Guests were offered free shots of vodka and whiskey, which Calum accepted and mixed with soft drinks.

He continued his travels with his group the following day and made it to the border before noticing strange effects to his vision.

The 23-year-old told BBC Breakfast: ‘I remember having this sort of kaleidoscopic, blinding light in my eyes and to the point at which I couldn’t see anything.

‘[We agreed] it was strange but we thought it was food poisoning and the light I was se

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