what are the adverse affects of sitting within the muddy and using a vdu?

Answer:

....zilch much.....

only one small problem though.....

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you may move about BLIND.....thats all.....nil to worry give or take a few.
I personally own never had any issues from doing so. If within is any affects from doing so it is mostlikely eyestrain, expecially if you are looking around alot just because of your pupils haveing to constantly readjust to the different level of light.