Hi,
you could also make a combination of skinning and a blendshape... 
e.g. make 2 joints (parented to the headjoint) in the middle of each eye... to get the arc when closing the lids, the lids should then be weighted to these joints, and a blendshape could e.g. also be used, to make the outer corner's of the eye look right when they are closed... 
regards
Strarup
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Alex V. U. Strarup
One mistake can ruin it all...