We will accept any cat into our sanctuary that is certified by a vet as a blind cat. Cats with 20% or less sight are accepted as blind. All cats must be fixed, FIV/FEL tested and current on all shots. Acceptance of Blind cats that are FIV/FEL+ will be considered on a case by case basis.
Facts about blind cats:

Blind cats are cats that just happen to not be able to see.

 Blind cats can do pretty much everything that a seeing cat can do. Cora, who sees nothing, climbs to the top of a 7 foot climber...she got there all by herself, and she will come down the same way she went up. One of the only things I have found that stops a blind cat cat is a gate, fence or wall. Because they can not see the other side of a gate, they have no concept that they can get to the other side. Blind cats can climb trees (they tend to back down feet first to get down), climb on cabinets, etc. 

Some things that will make it easier on your blind cat to live with you. Try to stay somewhat consistent on the important things, the litter box and their food. For the rest of the house, live normal, they will go around things. If you watch a blind cat, you will see that they point their whiskers out so the whiskers will brush against something typically before they hit it. I once had a daycare and Louie absolutely loved to be in the playroom with the kids and the chaos, nothing was every put away in the same place and there was always toys every where, it never bothered him.

 If you pick up your blind cat and move him/her from point A to point B, try to put your cat down where they have a good idea of where they are. Example, at their litter box, their food, or where the floors have different textures. My daycare playroom and dinning room went from carpet to tile, if I wanted Louie to leave the playroom, I would put him so front feet were on the tile and back were still on the carpet... now he knew where he was.

 A lot of people do not realize that a cat can become blind from not being wormed. I was shocked when my vet told me that. Apparently worms will migrate around the cats body and that included up behind the eyes where they destroy optic nerves, etc and thus an animal can become blind overnight (not really overnight, damage took some time to be done, but it seems like overnight to you when you discover it). A cat can become blind from illness, especially eye infections from upper respiratory infections, hyperthyroid, diabetes and high blood pressure. If your cat is sneezing, coughing and eyes are getting goopy, get to the vet for antibiotics! If your cat is eating like crazy and losing weight or drinking water like there is no tomorrow RUN to the vet!