OP, am I right in saying that you were doing the job, and then they gave you feedback on accuracy, and your response to that was to fire off an email requesting reasonable adjustments because of a disability you hadn’t previously declared?
No an employer can’t ask about disability at interview, but occupational health can when you start, and not declaring a disability which you are going to require reasonable adjustments for if asked can be a dismissible offence. Not because it’s a disability but because you have withheld information.
You’ve worked there for 12 days. A tribunal is going to take years. I know someone who is taking an employer to a tribunal for withdrawing a job offer because of her disability and her court date isn’t until next September.
it will be stressful, and potentially expensive if you don’t win which is a very real possibility.
I would just cut your losses and look for something else.
And if you do need reasonable adjustment because of your eyesight then tbh I would declare it at the start.
And yes, I have disabilities and I know how frustrating it is.