The answer is "Yes" and "No."
Back in the 1940s and 1950s there was hard radiation from the TV picture tube. It was a contributing factor to the development of cataracts among other things. Radiation (including light) drops off at the inverse square law. Every time you double the distance, you have one forth the radiation. Therefore moving back from the TV was a very good thing to do.
However, for a lot of years that factor has been eliminated by the materials in the picture tube glass. The frontal radiation has dropped to zero for all practical purposes. So, as far as radiation is concerned, it does not matter where you sit in front of the TV set.
All young children sit close to the TV. I don't know why, but they do. It would be nice to have a few bucks for every time a parent has asked me if their child has bad eyes because they sit so close. Or if sitting close is going to cause bad eyes. Gee, I could have a new fancy Delta TS or a SawStop with that kind of dinero.
If you have any further questions, do not hesitate to ask.
You notice that I said that illumination drops off on the inverse square law. That means you have one forth the amount of light if you are eight feet from the light bulb than you would have at four feet. This is the reason supplemental illumination is a very good thing. That lamp hanging on your BS or DP is there for a very good reason.
As long as I am talking about luminaires and lamps, let me take another minute of your time. Tubular lamps, like 4 ft or 8 ft fluorescents, are a good source of shop illumination. A tube lamp pretty much does not cast a shadow to be a problem when you use spinny things or pointy things. Then when you add supplemental lighting to your task to kick up the candle power you see even better.
First of all you have to be smarter than the machine.