I know, I was so scared too because they did not want to have do surgery on Zoe, only as a last resort, she has multiple eye problems not just an corneal ulcer that would not heal

I'll be crossing all fingers and paws for Scoop. I am not sure about the red, I think it depends on what kind of red. For Zoe, we wanted to see blood vessels in the white of her eyes, not inflamation red.
It is most likely different for each dog, depending on the treatment and what is all wrong.