The initial areds study investigation and findings are located here
http://www.nei.nih.gov/amd/
The areds 2 study started in 2006 and the results are supposed to be out some time during the second quarter of this year.
http://www.areds2.org/
The initial areds showed preservision to be the supplements closest to the recommended formula with different formula no for smokers.
My advice would be a good diet (or the recommended supplements if you are unable to eat the necessary foodstuff) and good UV protective eyewear.