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In the long run, it’s not really about which font is useful and which one is not. Isn’t it more important to ask – do I comprehend what I am reading? How focused am when reading and how long can I remain focused?
When we are in a state of frustration and disorientation, no font will make us feel better – if we are focused, have meaning with all the words we read and have corrected or mastered dyslexia – then I can see that a preference in a font can make reading even more enjoyable. Everyone will have a preference though, dyslexic or not.