Not the blasted OpenDyslexic font nonsense again. So far not a single study that I have found has shown using OpenDyslexic or other "dyslexic fonts" shows any measurable improvement in reading for people suffering from dyslexia.
The effect of a specialized dyslexia font, OpenDyslexic, on reading rate and accuracy for an example.
Some quotes from the paper:
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Results from this alternating treatment experiment show no improvement in reading rate or accuracy for individual students with dyslexia, as well as the group as a whole.
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Yet, no empirical research could be identified that investigated the effectiveness of the font with English readers, and very little research exists on its effectiveness in readers of other languages.
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Another paper was
Do Dyslexia Fonts Actually Work?. A quote from that paper:
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Researchers put the font to the test, comparing it with two other popular fonts designed for legibility—Arial and Times New Roman—and discovered that the purportedly dyslexia-friendly font actually reduced reading speed and accuracy. In addition, none of the students preferred to read material in OpenDyslexic, a surprising rebuke for a font specifically designed for the task.
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Also see
How to Counter Vision-Based Claims about Dyslexia “Cures” and their list of myth-busting links.
I worked in education and supporting special needs students for quite a while and we kept getting parents who read an item that said using OpenDyslexic, Dyslexie or other special font would be a "miracle cure" for their kids reading difficulties. Like any other snake oil remedies, they didn't work. The only consolation was that OpenDyslexic unlike Dyslexie was a freebie.