So, in short, you should have notified and you have not?
How long have you known about it?
Sorry, I meant about the condition?
There is nothing you can do about the fact that you didn't disclose earlier.
All you can do is put it right now. If you disclose it to them then it might well not be discovered that you knew about it for years and did not disclose it. Half the time they do not notice.
It also may well not be of a type of that engages their interest.
They may revoke your licence immediately while they investigate. That is a common response from the DVLA as road safety is paramount. That doesn't mean they won't concede in the end though.
Can I clarify anything for you?
You might well be.
They may not revoke.