how far can "welding flash" cause eye damage?

is there any considarations one this matter (ex.: when you must put curtains to shield bystanders/near-workers)?
are there studies (data/statistics) on eye injury to bystanders/near-workers?
ahead thanks from brasil.

Answers:

From: wally

if you are not using any type of welding blind or any type of protection for covering the arc, a distance of a minimum of 40 feet(12 meters) is a safe distance to prevent arc flash.

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