I've been sprayed with both Fox and Sabre. Neither had any effect on my eyes or mucus membranes. They were full double-Z facial sprays, not the "Let me squirt this on a q-tip and rub it on your skin under your eye" BS method that some people try to claim is the same as being sprayed...
After about 3-4 minutes, my skin was burning, but I had already subdued the "attacker" (training, mind you) so it was a moot point. 10 minutes in a hot shower relieved this to a certain point. About an hour or two after being sprayed, I suffered no effects aside from mild skin irritation.
Moral of the story; don't count on any spray to take someone out of the fight.
"To preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them." -Richard Henry Lee, Virginia delegate to the Continental Congress, initiator of the Declaration of Independence, and member of the first Senate, which passed the Bill of Rights.