maybe the green filter works , because green is the most natural occuring color and our eyes can cope best with that. just a guess. or it filters out the harsh spikes like ksf phosphors etc.?
i also notice not much green in human build environment. i really enjoy going into the woods and watch at green fields of treas and leafs. this green relaxes my eyes somehow.
maybe our eyes are also exhausted by the explosion of blue and red light coming with artificial lightning and human structure. who got green walls or anything green in their apartments? everything is white, greyish, sometimes beige or sand.