Ravers lose sight at Russian laser show

Industry Web site www.laserfx.com said focused laser light can cause eye damage almost instantly.

The owner of a Moscow laser rental company told Reuters the accidental blindings were due to "illiteracy on the part of technicians".

"It was partly the rain, but also partly the size of the laser. Somebody set up an extremely powerful laser for such a small space," said Valentin Vasiliev, who said his company did not provide the Aquamarine lasers.

(Additional reporting by Tatiana Ustinova; Editing by Giles Elgood.)