Understanding the Different Types of Dyslexia
Dyslexia doesn't look the same in every child - or every adult. Some struggle to sound out words phonetically. Others can decode perfectly but can't recognize common words by sight. Some read accurately but painfully slowly. Understanding which type of dyslexia is present matters because each type responds differently to interventions, and a one-size-fits-all approach rarely works.
Here's a breakdown of the main types and what they look like in practice.
Wondering which type of dyslexia your child has? A dyslexia assessment can identify exactly what's going on and what support will help most.
1. Phonological Dyslexia
Phonological dyslexia is the most common type. People with phonological dyslexia struggle to connect the sounds of language to the letters that represent them — a skill called phonemic awareness. When they see an unfamiliar word, they can't sound it out because the relationship between letters and sounds doesn't come naturally.
What it looks like in practice: a child who reads "dog" correctly every time they've seen it before, but completely falls apart when they encounter a new word they've never seen. They might guess wildly based on the first letter, or simply refuse to try. Spelling is often significantly worse than reading, because spelling requires generating the sounds from scratch rather than recognizing a familiar pattern.
Phonological dyslexia responds well to structured literacy approaches that explicitly teach phonics — the relationship between sounds and letters — in a sequential, cumulative way.
2. Surface Dyslexia
Surface dyslexia is essentially the opposite of phonological dyslexia. People with surface dyslexia can often sound out words quite well - their phonological skills are relatively intact - but they struggle to recognize whole words by sight. Every word, even common ones they've seen hundreds of times, has to be decoded from scratch.
What it looks like in practice: a child who reads slowly and laboriously, even though they technically "can" read. They might read "said" as "sayed" because they're applying phonics rules to an irregular word. Reading for meaning is difficult because so much mental effort goes into decoding each individual word that there's little left over for comprehension.
Surface dyslexia is sometimes called visual dyslexia, though this can be misleading - it's not primarily a visual problem. It's a difficulty building the automatic word recognition that fluent readers rely on.
3. Rapid Naming Dyslexia
Rapid naming dyslexia affects a specific skill: the ability to quickly retrieve the names of familiar things - letters, numbers, colours, objects. People with this type of dyslexia may have reasonably solid phonological skills but read very slowly because their brain takes longer to retrieve and produce the words they need.
What it looks like in practice: a child who reads accurately but is painfully slow - finishing last on timed reading tasks, losing their place frequently, and becoming exhausted by reading because it requires so much sustained effort. Comprehension often suffers not because they can't understand what they're reading, but because the process of decoding takes so long that they lose the thread of meaning.
4. Double Deficit Dyslexia
Double deficit dyslexia combines phonological dyslexia and rapid naming dyslexia - difficulties with both phonological processing and speed of retrieval. As the name suggests, having both deficits together creates more significant reading challenges than either alone.
What it looks like in practice: a child who struggles to decode unfamiliar words and reads slowly even with familiar ones. Reading is effortful, slow, and inaccurate all at once. Double deficit dyslexia typically requires the most intensive and comprehensive intervention, and children with this profile are most at risk of falling significantly behind their peers without targeted support.
5. Visual dyslexia
Visual dyslexia is less common and involves difficulties processing visual information accurately. People with visual dyslexia may experience letters or words appearing to move, blur, or reverse on the page - making reading physically uncomfortable as well as cognitively challenging.
What it looks like in practice: a child who complains that words "jump around" or that their eyes hurt when reading. They may lose their place frequently, skip lines, or re-read the same line multiple times without realizing it. Letter reversals - reading "b" as "d" or "p" as "q" - are sometimes associated with visual dyslexia, though it's worth noting that some degree of reversal is developmentally normal in younger children.
Visual dyslexia may benefit from coloured overlays, specific fonts, or adjustments to text spacing and background colour alongside literacy intervention.
Which type does my child have?
Most people with dyslexia don't fit neatly into a single category - profiles overlap, and many children show features of more than one type. This is one of the reasons a formal assessment matters. A psychologist can identify exactly which skills are affected, how severely, and what combination of approaches is most likely to help.
Without that clarity, well-meaning interventions often target the wrong skills, or address one area while missing another entirely.
What to do if you suspect dyslexia
If you recognize your child - or yourself - in any of the descriptions above, the most useful next step is a formal dyslexia assessment. A comprehensive psychoeducational assessment identifies which type of dyslexia is present, rules out other possible explanations for reading difficulties, and produces a written report with specific, evidence-based recommendations that schools and other professionals can act on.
At Bluebird Psychology, we provide dyslexia assessments in Calgary for children, teens, and adults. Our registered psychologists use gold-standard assessment tools and provide detailed written reports accepted by Calgary schools, Alberta Education, and universities.
