Something I try is, keep your eyes on the word but at the same time write down what you see. It’s surprising how you can see a word when written in your own hand.
Another tip I had, which is basically to disrupt the eye brain conduit that sometimes tells us things that are not correct is to turn the piece upside down. This forces the eye to look and assess and keeps the brain out of it until this is done.
I think the idea of saying it is very useful. I have gone to the lengths, when trying to work out the names of Irish forbears, who at the mercy of officials in other countries recording their names, of listening to and imprinting in my brain an accent from the place in Ireland they may have come from. I then say what is recorded over in this accent until I get the Irish surname.
Tip: do this in the privacy of your own home!
