Ok, I was generalising and I think I used the word 'generally'. I should have said "severe dsylexic"'. There is no such thing as dyslexia as a uniform condition. The term encompasses many different disabilities to varying degrees through dyslexia and dyspraxia and it's only recently that these conditions have become better understood .
The original question asked was about a student whose reading and writing was poor, and it was with this in mind, I slanted my answer. This will be a problem for him. There are also others who have mild and different forms of dyslexia which prevent them for recognising symbology for example, an aircraft instrument. The student I referred to in my earlier post had such a problem. His reading and writng were fine, but he kept on misreading instruments. He had a digital watch because, by his own admission he couldn't read analogue watches.
I do know about dyslexia. It runs in my family.