I'm guessing that's from mites, the same as scaly leg mites. I haven't seen this before though.
I think your antifungal cream is acting like a sealant so it's killing the mites. Vaseline is what is usually used for scaly leg mites so maybe that would be less irritating to their eyes as it looks like one got some of your cream in their eyes. The ivermectin you gave should be helping that too.
If that's what it is, it can take several weeks, even months sometimes but you're sounding like they're improving a little.
I'd give them vitamin water too, like Nutra Drench or Poultry Cell, etc.