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Dyslexia and reading speed — does font choice actually make you read faster?
The short answer is: not by much, and not in the way you'd hope. But the longer answer is actually more useful — because reading speed is the wrong thing to optimise for, and the research on fonts and dyslexia points toward something that matters more.
What "reading speed" actually means
When someone asks whether a font makes them read faster, they usually mean one of two things. The first is raw throughput: words per minute on a timed passage. The second is effective reading rate — how much text you absorb, accurately, in a given amount of time, factoring in re-reads, comprehension errors, and fatigue. These two things are not the same, and they respond very differently to font changes.
For readers with dyslexia, the bottleneck in reading speed is rarely the eye's physical scan rate. The bottleneck is decoding: the process of converting letterforms into phonological representations and then into meaning. This is a cognitive load problem, not a visual acuity problem. A font change affects the visual layer — the legibility and distinctness of individual glyphs — but it doesn't touch the deeper phonological processing deficit that is the hallmark of dyslexia in most clinical models.
That distinction matters because it sets a ceiling on what any font can achieve. A font can reduce the cognitive cost of decoding by making letterforms less confusable — less prone to the b/d/p/q mirror-image confusion that many dyslexic readers experience. It can reduce visual crowding. It can make each word's boundary clearer. What it cannot do is rewire the phonological pathway itself. Understanding this is the starting point for reading the research honestly. You can also explore how working memory interacts with reading to understand why decoding difficulty has such an outsized knock-on effect.
What the research actually found
Several studies over the past fifteen years have tested whether specific fonts improve reading speed in dyslexic readers. The results are consistent enough to draw a clear conclusion: purpose-built dyslexia fonts do not reliably improve words-per-minute scores over well-designed conventional alternatives. This is a finding that surprises a lot of people, and it's worth sitting with.
The most-cited work in this space looked at OpenDyslexic — the open-source font with weighted-bottom letterforms designed to prevent visual rotation of b, d, p, and q. Across several independent studies, objective reading speed for OpenDyslexic versus Arial or Times New Roman showed no statistically significant improvement. What did improve, consistently and clearly, was self-reported comfort and reading preference. Participants read at the same speed but said it felt easier and that they were less tired afterward. Error rates on specific letter-confusion tasks also dropped. See our full guide on OpenDyslexic in Chrome for what those studies found in more detail.
Lexend, a more recent typeface family created by Bonnie Shaver-Troup and Thomas Jockin and released by Google in 2019, was designed from a different starting point. Rather than targeting dyslexia specifically, it was designed to reduce visual crowding and improve what the designers called "reading proficiency" — the ease with which the visual system processes text. Lexend's letter spacing, stroke contrast, and glyph proportions were tuned using reading-velocity data rather than aesthetic conventions. Studies commissioned during Lexend's development showed meaningful improvements in reading fluency across various reader profiles, including struggling readers. Independent replication has been more mixed — reading speed improvements of 5 to 8 percent have been reported in some populations and not replicated in others. That said, Lexend remains the font with the strongest direct claim on reading speed improvement for non-fluent readers. You can apply it to every website via LexiFont's Lexend mode.
Atkinson Hyperlegible, developed by the Braille Institute, was designed for readers with low vision rather than dyslexia specifically. Its defining feature is high inter-character distinctiveness — every glyph is designed to be as different from every other glyph as possible, minimising the chance of misidentification. Studies of Atkinson Hyperlegible in low-vision populations showed meaningful improvements in character recognition accuracy. For dyslexic readers without a low-vision component, the picture is less clear — but high distinctiveness is generally useful for anyone whose reading involves letter confusion. More in our Atkinson Hyperlegible guide.
| Font | Designed for | Speed effect in research | Strongest effect found |
|---|---|---|---|
| OpenDyslexic | Dyslexia (letter rotation) | None significant | Reduced letter-confusion errors; higher comfort |
| Lexend | Reading proficiency broadly | Modest (5-8% in some studies) | Fluency in struggling readers |
| Atkinson Hyperlegible | Low vision / character legibility | None significant for dyslexia | Character recognition in low vision |
| Arial / Helvetica | General use | Baseline | Neutral — no specific dyslexia benefit |
| Times New Roman | General print use | Slightly slower in some dyslexia studies | Commonly used as unfavourable control |
One consistent finding across nearly all these studies: serif fonts — particularly traditional newspaper-style serifs like Times New Roman and Georgia — tend to perform worse for dyslexic readers than clean sans-serif alternatives. The serifs add visual noise at small sizes and make letters more similar to one another. The debate about serifs versus sans-serifs for dyslexia goes deeper than font choice alone, but as a starting rule, sans-serif is the safer default.
Why comfort is the metric that compounds
Here is the thing that gets lost in the speed conversation: reading is not a single event, it's a habit. The question is not "does this font let me read 8% faster for the next five minutes?" — it's "does this font make reading feel comfortable enough that I do more of it?"
Reading volume matters enormously for literacy outcomes, vocabulary development, general knowledge, and professional performance. A reader who finds reading effortful reads less, and reading less compounds negatively over years. A font that doesn't change your WPM but makes you willing to keep reading for another fifteen minutes is, in real terms, a more significant intervention than one that adds five words per minute but feels tiring.
This is why the self-reported comfort data from OpenDyslexic studies is not a consolation prize — it's actually the important result. If a font makes reading feel less like hard work for the 15-20% of the population who struggle with print, the downstream effects on how much reading gets done are meaningful. The same logic applies to choosing the best font for dyslexia in general — comfort and sustained use are better goals than marginal speed gains.
The practical takeaway: don't optimise for the fastest font. Optimise for the font you'll still be reading happily in twenty minutes. They're not always the same thing, and the second one is more important.
The factors that actually move reading speed
If font alone has a modest effect on speed, what does work? The research is clearer here than people expect.
Line spacing has a stronger effect on reading accuracy and speed than typeface in most dyslexia studies. Tightly packed lines cause the eye to track the wrong line — a problem called line-following error — which forces regressions and slows reading substantially. Most web pages use line heights of 1.4 to 1.5, which is adequate for fluent readers but often too tight for dyslexic readers, who benefit from 1.6 to 1.8. The full picture on line spacing and letter spacing for dyslexia goes into the optimal settings.
Line length is similarly underrated. Very wide text columns require large saccades and increase the chance of losing your place when the eye returns to the start of the next line. Most readability guidelines recommend 60-75 characters per line for body text; for dyslexic readers, erring toward 55-65 is usually better. Reader modes in browsers enforce this almost by accident — which is part of why they help — and it's worth checking our comparison of reader mode versus reading extensions for dyslexia to understand when one beats the other.
Background colour interacts with font choice in ways that are hard to predict from published research, because it's so individual. Some dyslexic readers find high-contrast black-on-white straining; cream or light grey backgrounds reduce what's sometimes called "visual stress" and allow them to read for longer. The font that reads fastest on white may not be the font that reads fastest on a tinted background.
Font size has a direct effect on reading speed up to a threshold. Most studies put the sweet spot for dyslexic adult readers somewhere between 14pt and 18pt in body text — larger than the typical web default of 16px (roughly 12pt on most screens). Going larger than 18pt tends not to help and can actually slow reading by reducing the number of words visible in each saccade. Our post on the best font size for dyslexic adults walks through the evidence in more detail.
How individual variation wrecks generalised advice
One reason the research produces mixed results is that dyslexia is not a single condition with a single profile. Some dyslexic readers have a primarily phonological deficit — difficulty mapping sounds to letters — and will benefit differently from a font change than readers whose main difficulty is visual: letter-shape confusion, crowding, or tracking. Some readers have both; some have neither in a severe form and instead have processing speed differences.
This means the only reliable way to find your fastest font is to measure it yourself, on text that matches your actual reading context (articles, emails, documents — not disconnected sentences on a test screen). The font that improves a researcher's cohort's mean score by 6% may not help you at all, and the font the study found neutral may be transformative for your specific profile.
The practical implication: treat published font recommendations as a shortlist for personal testing, not as a ranking to apply directly. LexiFont's free tier lets you switch between several fonts on any live website in one click, which means you can test the same article in OpenDyslexic, Lexend, and Atkinson Hyperlegible in the space of five minutes and notice which one you're still reading without feeling the effort. That five-minute test is worth more than the academic literature for your specific use case.
A practical testing approach
If you want to estimate your reading speed in different fonts rather than just relying on comfort, here is a simple protocol that takes about twenty minutes:
Pick three articles on a topic you're familiar with, each around 600-800 words (so a known quantity of text). Read one in your current default browser font. Read the second in Lexend or Atkinson Hyperlegible. Read the third in OpenDyslexic. Time each one from first word to last. Then, without looking back, answer three to four comprehension questions about each article — just write a sentence or two about what you remember. Compare not just the times but how many things you retained.
A few caveats: article difficulty varies, so pick pieces at a similar reading level. Topic familiarity affects speed more than font does in most cases, so don't use an article you've already read. And do this on a day when you're not fatigued — reading speed drops 10-15% when tired regardless of font, which will swamp any font effect you're trying to measure.
If you have LexiFont Pro, you can switch fonts mid-article with a click, which lets you compare within a single piece and eliminates the difficulty-variation problem entirely. It's the cleanest way to isolate the font variable.
The honest bottom line
Font choice is unlikely to add more than a few percent to your raw reading speed. It is very likely to affect your reading comfort, your error rate, and - crucially - how long you're willing to keep reading. For most people with dyslexia, the practical gains from finding a font that reduces fatigue are larger than any speed gain the best font in the world could deliver.
Start with Lexend if you want the best evidence-based case for speed improvement. Start with OpenDyslexic if letter confusion is your main issue. Start with Atkinson Hyperlegible if you also have low-vision concerns or find high character-similarity a problem. Then adjust based on what you notice — not what a study said.
Further reading
- Best fonts for dyslexia in 2026 — a research-first guide
- Line spacing and letter spacing for dyslexia — what actually matters
- Serif vs sans-serif for dyslexic readers — what the research says
- Reading and working memory in adult dyslexia
- Reader mode vs reading extensions — which is better for dyslexia?