light exposure

I am newly diagnosed with dry eye ARMD and my Doctor told me that I was "very early" and he did not want to see me for a year, however, he did put me on the vitamin regime and told me to avoid exposure to sunlight. I have read interesting information on this forum and have a few questions:
What is meant by "blue light"?
Is reading watching TV and working with my computer harmful?
Is wet eye more serious than dry eye ARMD?
On average how quickly does this dread disease advance?
I really would appreciate knowing the basics in terms that I can understand as I seem to be a little unsure of myself at this point.