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Only way to find out is to go to your diabetic eye screening. Not going because you are worried about what they may find is pointless.
If there is a problem, not knowing about it doesn't make it go away, it just pretty much guarantees that it will get worse because they can't treat it if they don't know about it.
If there is no problem, you are worrying over nothing
I asked my optician just this question. She said they look for slightly different things, although there is overlap and she will sometimes spot things that the customer seems to be unaware of. If so, she gives people a really strong recommendation to go and get an NHS test, because she can't make a formal diagnosis.
To me that means have both. If there is a problem doing nothing about it won't help, and it's the sort of thing that doesn't just "go away".