[ifh-hn]

Context: severely dyslexic and have a visual stress thing too; both diagnosed, both late in life.

With that out the way. This person, unless completely not self aware, knows they can't spell and are making mistakes.

It's just a fact. Tell them to slow down and double check their work because they're making mistakes. Offer support and point them in the direction of help as appropriate per company guidelines.

But at the end of the day if they're causing issues, they're causing issues and they need to know. It's something they need to adapt to, not you to them.

You cannot engineer your way around this specific person's faults (for want of a better word). You'd have to do the same for the next person who was making mistakes.

TL;DR

Be up front and tell them they are making mistakes and need to improve. Offer support as required.

[tornadofart]

Thanks for your insight. I guess his reaction deterred me from pressing the issue but that there may be no way around it.

[ifh-hn]

There are reasonable adjustments that can be made, when there's a know issue. But the key term is: reasonable.

Their reaction, to me, speaks of denial or embarrassment and inflexibility. They're clearly aware they have an issue.

The team though can't be coming down on them and blaming rather than adapting too. Reasonable adjustments work both ways. Team work is not about blaming individuals but about working together. Everyone has strengths and weaknesses.