I've been following the postings on your unhappy story, and really hope Swampy is doing better today. What a thing for you both to go through.
I thought I'd let you know that I have an almost blind 8 yo cat - although he was already like this when I got him 6 months ago. Friends also had a cat that went completely blind. My Mitz manages really well. While I do find it sad to think how much more he could get out of life if he could see, his quality of life is generally good. You soon learn to make the house (and in my case, the garden) safe for them, and there are a few toys he can respond to. He loves his food, cuddles and body scrubs, he is great pals with his sighted litter mate, (although she does swat him from time to time to stop him treading on her!), and has his favourite spots for sleeping. Swampy already knows the layout of the house, although he will have to re-learn it again, but if his sight doesn't return fully, all is not lost.
However, I'm keeping my fingers crossed for youo for a full recovery soon.