That’s too bad...

So sorry for your loss of the little one.
The decision to keep a blind bird is a
very personal one. There are so many variables involved. Much depends on your husbandry methods whether or not a blind chick would thrive in your flock. It takes a lot of commitment and extra care to integrate a blind chick.
It takes just as much courage to euthanize one.
In a relatively small flock, that is maintained
in a run & rarely free-ranged, a blind chicken can do very well. By placing a few extra feeders and waterers in the run, and
always putting them back in the same places, a blind chicken will be able to eat and drink easily. They learn
really fast.
Free-ranging tends to work best when the available area is small & well-defined, and you‘re out there often, at least until you are certain the blind one can navigate alone. As with the feeders & waterers, everything must stay in just the same place— pots, furniture, plants, etc.
A rooster in the flock can also be helpful— the blind bird may be particularly responsive to the rooster’s calls & warnings. And they’ll come running with the rest when he calls.
There are many stories on this site about birds that are blind or have very limited vision but who are thriving & happy. They’re quality of life may be slightly different, but they don’t know any better, so they are happy just as they are.
Good luck & God bless.