Birds (like people) can adjust very well to losing their sight.
1. Keep your bird's wings trimmed so s/he doesn't try to fly. Wing trimming is essential for any bird, but especially for a blind bird -- flying could result in a bad accident, injury, and even death. If his/her wings are trimmed properly, then when s/he tries to fly s/he will flutter harmlessly to the ground. Every bird responds to being startled with the "flight" response -- and he may take off flying inside the house (or worse, if he gets outside).
2. Be sure to offer your bird lots of different kinds of toys and rotate them so that s/he keeps busy. Blind birds don't have the advantage of being entertained by seeing what's going on in the room, so new and varied toys prevent boredom. Try toys that have different textures or make noise (peacock feather preening toys or bells, for example)
3. Regarding the food you feed him, offer all sorts of different tastes and textures. Again, this keeps him stimulated mentally and will give him something to do. Mickaboo's web site has a lot of bird care information and food ideas.
4. Be sure, when you clean his cage, to put the perches and food dishes back exactly where they were. I count the bars on the cage, or put a clothespin there to mark the spot temporarily while cleaning the cage, so I know exactly where to put them back when I take them out to clean them. I have lots of perches (I prefer the rope-type of perch, that is shapeable). I have three of them in D'Jango's cage and he is able to maneuver his entire cage circumference by walking on these perches.
5. Keeping your bird's cage clean is more important than ever. Since he won't have his sight, he'll have to depend on "feeling" things with his beak. Clean and disinfect the cage often. Be sure to wash out his food and water dishes with soap and water (or in the dishwasher) between feedings. I have several sets of dishes, so I can just take out one and replace it with a clean set.
6. If your bird is on a pelleted diet (which your avian vet will likely recommend) then experiment with different sized pellets (if you can, get samples of smaller and larger sized pellets from friends or the local bird store.). Sometimes your vet will have trial sizes. D'Jango actually prefers to eat the larger pellets (Macaw/Large Parrot-sized), although he is a fairly small bird. It gives him something to do, working on the larger pellets. I actually mix three sizes of pellets in his dish, to give him variety. He especially enjoys foods that take a little time to eat -- a slice of apple wedged between the cage bars, a chunk of uncooked corn-on-the-cob, a chunk of cooked sweet potato, a stalk of broccoli, a piece of carrot. The more variety I offer him, the more he is entertained by the food's taste and textures.
7. D'Jango will bite when he is startled, so I speak to him before I do anything. If my hand is going to be anywhere near him, I use words first like, "D'Jango, ready to go night-night?" or "D'Jango, give me your foot." Then he knows something is going to happen and he's prepared for the movements that follow.
I know you'll find that any bird can adapt to being blind. Most of the time I forget that D'Jango is blind. He doesn't let it hinder him and neither do I!