A thing with Hexes though, is the Tilts. Some of they might last for the entire duration as they lack possible resolution rules when they come from non damage magic. One could argue that it's reasonable that one looses eyesight for the duration of the spell by giving the Blinded tilt two times on someone. As it is resolved when the damage heals, but no damage was done it might just stick around for the duration. Not sure yet how I would interpret the situation myself, but gut feeling says this is reasonable. As it is mage, (or cofd in general), other supernatural abilities could cure it.