From a past experience, I believe a blind calf can be the result of a vitamin A deficiency.
In 2019, there was a calf with a white cloudy left eye. She was having problems keeping up with Mom. At 5 days old, she was eating dirt and having difficulty nursing. She became a bottle calf. I gave her 2cc BO-SE and 4cc vitamin E-AD. A few weeks later the eye appeared normal. She acts normal now and should have her first calf in Fall 2021.
...I guess I don't recommend keeping bottle calves for replacements. They can be a pain. Bottle calves as adults can be harder to work through the chute. They won't move out of your way, you have to walk around them instead. They learn how to hook you when walking by with a feed pail. Bottle calves grow up to be stinkers.
Not to change topic, but I have read posts on Cattle Today regarding a cow missing a lactation due to a dead calf or bottle calf. Some people try to replace the calf with another. Does something happen to the cow if she goes a year not nursing a calf? Thanks.