In response to your request for definition of flurescense:
I'm speaking about fluorescent backlighting in LCD monitors.
Also phosphors in very new CRTs.
It doesn't even help to dim them.
Many other so-called solutions do not help either. I've de-bunked them on my site.
Once a person has been over-exposed, depending on his/her make-up, he/she develops an intolerance.
For more details & my story, you can find my site by keying "monitorpain" as key word in Google.