Sorry for delay in reply. Sadly your field defect is likely to be permanent yet not progressive.
Although I do not know thw workings of the CAA medical side it's likely that the "onus of proof" will be on you to prove that your field defect has no impact on your normal functional vision.
Informal discussion with the CAA about what you can do to help them, or what tests they require, to quickly reach a decision may help.
I suspect you'r in for a bit of a long haul however unfair it may be.