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Kilkrazy wrote:Fluff is fluff. The fluff is that Tau eyes cannot refocus as quickly as human. This makes more difference at close range rather than long range since the further away an object is, the less refocussing it takes to get it in focus.

This would account for the Tau preference for distance weapons, which in turn should make them better shots since they spend more time practicing shooting.

Anyway, fluff is just a convenient excuse for making the stats be the value needed for the game. The fluff can say that technology makes Tau BS4 -- targetting matrix, etc.

I completely agree. I'd like to, also, add that the fluff can change to suit game needs. It's happened before and will again. Heck, It seems originally the Tau only had disconcerting black orbs for eyes. The it went to pupiless eyes with the codex models having burning red eyes. Next codex it may be part of how you tell castes from one another.
Earth caste=brown eyes
Water caste=green eyes
Air caste=blue eyes
Fire caste=red eyes
Ethereal=white eyes

Not saying it will be this, just that GW could do it so don't necessarily limit your wish list to prior fluff.