Hi Cadillazac,
It seems that the "air" has a different screen, or different system to activate the led backlighting, probably to save weight and thickness. This result (in my opinion) to low led frequency and poor modulation. There are many post on this problem.
The led ligthing is made of two part. One "on", one "off". If your led is activated at 100 hz, the total signal period is 1/100 of a second. Part of this time the led is "on", part of this time the led is "off". When the led is "on" the light is very bright (even blue which I read is bad as well!?). When "off" the light is nul, zero. The signal is square and abrupt. Eyes and brains do not like this, and especially if the time "off" is important in comparaison to the time "on". Some are not aware, and will one day suffer consequences, some like us know and feel the problem.
I have been folowing this since I got my macbook air 2010.
I am waiting for Apple to give us a problem free screen. Their problem is probably the cost. But they should know I'll pay any price to not get blind !
Saludos,
Amerix