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Dozens of young revellers were blinded by a laser show at a dance music festival near Moscow last week and doctors fear the damage may be irreparable, the Kommersant reported.
"More than 30 people between the ages of 16 and 30 have ended up in hospitals with damaged retinas," it said.
One doctor said: "The loss of eyesight in some cases is up to 80 per cent and it's unlikely it can ever be restored."
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