I did rear one to about 5 weeks old. But then I put her down. She trembled all the time in fear, she was always stressed and none of the other babies were nice to her. The only time she was happy was at night because the others stood still so she could cuddle them. She couldn't free-range, was frightened by bugs. It was sad.
She was a very sweet chick, very loving and used to being handled. In fact, she tried to never be set down! But she only drank when I was there to help her. I work full time and summer was coming. DH felt it was kinder to cull her.
Before I realized she was blind, I was making a gruel for her to eat/drink. Fed it to her mornings and evenings. I added vitamin supplements (baby liquid vitamins) to the gruel, which was made of chicks starter, warm water and a dab of honey. It was pretty thick until she learned to scratch and find the feed. Then I went to only giving her water.
My chick may've had more issues than blindness. Sometimes I though there were neurological issues too. She couldn't hit the bowl 2 times in a row even if it stayed stationary. I'd eventually give up and move it under her beak again.