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I've edited for about two decades on backlit screens. During that time, I've worked with hundreds of people and not heard about backlighting being a problem. We did have a bunch of repetitive stress injury cases and such, but that has tapered off with improved ergonomics and awareness.
In addition to working full time on backlit screens, I've read for leisure on backlit screens for hours at a time, starting in the mid-1990s. No problems.
My husband is an IT guy who has worked on backlit screens for nearly 25 years without problems. He also is on his computers for hours daily away from work.
Your mileage might vary, of course.
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