Hi Denise,
I only have a few minutes here and just happened to catch your post (I've not been around much at all for various reasons), so I'll tell you what I know about the collars....and yes, they're used for all sorts of things. (also so glad Ms. Lucy's problem was caught before it got even worse! Abscesses can be very dangerous if they go unnoticed, although the farther from the head, the better) How MUCH you keep them on at home depends on how often you HAVE to, according to the problem. Both Sabin (esp.) and Nissa had to wear those a number of times for eye problems. Being very small cats, I had to cut the edges of them down (all around) to JUST the right length so that they'd do their job of keeping paws away from their eyes, but also allow them to eat by themselves at will. This just took a bit of observation at the bowl and judicious trimming until they were just right, each according to their own size.
I also replaced the tape-like tie they had around the neck portion with a long enough and wide enough strip of cheesecloth, as that was softer, more washable and easier to tie up again. The only cleaning I usually had to do, since they'd been shortened to fit better, was a quick wipe where bits of wet food fell during a meal, and to let them groom themselves while I sat RIGHT THERE so they couldn't wash or rub their eyes during bathing. (if they tried, I'd simply hook my finger gently across their wrist to stop them and guide their 'arms' away from there) They slept in their collars and didn't seem to really mind them THAT much after the first day each time, although they couldn't curl up normally and I felt SO bad for them.

Ours were semi-opaque plastic, with 3 loops that stuck out a wee bit around the base, for the cloth tie to be threaded through. They could also be adjusted width-wise, for different sized necks, as they had 3 sets of notches along the sides to either tighten or loosen them as needed, so to get them off, all I had to do was give a swift little tug and they'd pop right off (with the tie undone and loosened, of course).
If yours isn't that well-constructed, maybe you could ask your doc if they've got any better ones around. Once I got one at a different vet's and it wasn't nearly as good or convenient and when I 'complained', they gave me a better model.....though the original ones I kept at home were still better so I switched as soon as home.
Our kids even went outside with them on if it was in the warmer months, with me right by their sides, of course. Sabin always tried to do ALL his normal stuff in his collar, even climbing trees (nothin' ever stopped
him from living his life BIG!

) so I just had to be vigilant and prepared to move like lightning if need be! Playing wasn't as fun for them, but they still managed at least some.
I also remember when my H's dog (when he was alive; a large lab-shepard cross) had to wear one to stop him from chewing a "hot-spot". Given his size, the collar was as big as a lampshade and looked just like one, too! He was fond of putting his head right up to the side window by the door and barking if someone was standing outside.....well, he tried this with his 'lampshade' on, pressed right up against that window....and darn near deafened himself with his own bark!

I had to run out of the room, I was laughing so hard and didn't want to embarrass him (he hated being laughed at).
I'm also sorry to hear about your mom's condition and all the stress that adds to your life, and hope she's eating up a storm once she gets all her 'treats'. I wouldn't have much appetite under the same cir%%stances and in the same setting, either, and I know it's often a problem. Having some company will likely benefit her. I mean, how many people like to eat alone? The right supplements might also help overall, too.
And yes, do let us know about Ben as well. Hope all is well with him and the rest of your family, and that Ms. Lucy's thyroid levels are good, too. Take good care, all of you.