Size Matters
Why bigger letters mean better learning
When I think about the interventions that I use with kids in my practice who have learning disorders, “write bigger” isn’t a flashy one, but it is highly effective, and there is a solid body of research to back it up.
Before we talk about it, though, I want to be clear about one common misconception: dyslexia is not a visual disorder. It is a language-based learning disorder typically rooted in phonological processing deficits. Reversing letters and seeing words “move on the page” are myths. Still, though, making text physically larger tends to help enormously. Here’s why.
Even though dyslexia isn’t primarily visual, the visual environment on a page still matters. Visual crowding—the way tightly packed letters interfere with our ability to identify individual characters—is a real challenge for many struggling readers. When letters are small and crammed together, we have to work to isolate each one before we can begin the work of decoding. When students have baseline difficulty matching letter symbols to sounds, this can be one more demand stacked on top of an already taxing process. Increasing font size and letter spacing reduces the crowding effect so the reader can spend less effort on visual parsing and more on the actual task of reading.
The benefits don’t stop at reading. Writing big is equally powerful as a math intervention.
Math requires students to manage spatial relationships on the page: columns that must stay aligned, digits that carry from one place to the next, fractions that need clearly separated numerators and denominators, etc. When a student writes small and cramped, the spatial relationships collapse. When students write larger, the work becomes more organized. The spatial structure of the problem is preserved on the page so they can see and keep track of what they wrote down.
The reasons for these benefits are twofold. First, writing big reduces fine motor demands. Many students with learning disorders also have co-occurring difficulties with fine motor control, so writing small symbols requires a level of control and precision that can be exhausting. Larger writing allows looser, more fluid movements. The physical act of writing becomes less taxing, leaving more cognitive bandwidth for the content itself.
Also, writing big supports attention to detail. When numbers and letters are larger, a student can easily spot the difference between a plus sign and a multiplication sign and keep track of negatives. Errors that come from not quite seeing what you’ve written drop dramatically.
Ultimately, writing big may not be fancy, but it’s accessible. It costs nothing. It requires no special software or equipment. But the benefits touch nearly every academic challenge a student with a learning disorder faces.
So thankful that these are not my colleagues