What Is Dyslexia?
Dyslexia is a specific learning disability that is neurological in origin. It is characterized primarily by difficulties with accurate and fluent word recognition, poor spelling, and weak decoding abilities. These challenges typically arise from a deficit in the phonological component of language; that is, the ability to hear and manipulate the individual sounds (phonemes) that make up words.
Dyslexia exists on a spectrum and is unrelated to overall intelligence. Many people with dyslexia demonstrate significant strengths in reasoning, creativity, problem-solving, and spatial thinking. Estimates suggest dyslexia affects 5–20% of the population, making it the most common learning disability worldwide.
Signs of Dyslexia
Early identification greatly improves outcomes. Signs can appear as early as preschool, though diagnosis typically occurs once formal reading instruction begins.
Preschool and Elementary
Difficulty learning nursery rhymes or recognizing rhymes; trouble learning letter names and their sounds; slow to add new vocabulary words.
Elementary School
Reading significantly below expected level for age; difficulty sounding out unfamiliar words; slow, laborious reading; avoiding reading aloud; poor spelling that doesn’t improve predictably.
Secondary School
Reading slowly and without fluency; difficulty summarizing a story; trouble learning a second language; poor note-taking skills.
Across All Ages
Strong verbal ability that sharply contrasts with written language skills; easily fatigued by reading; reliance on memorization over phonetic decoding.
What Causes Dyslexia?
Dyslexia has a strong genetic component. Research using brain imaging (fMRI) has shown that people with dyslexia process written language using different neural pathways than typical readers, particularly in areas of the left hemisphere involved in phonological processing. Studies by Shaywitz et al. (2003) at Yale demonstrated that the brains of dyslexic readers show underactivation in the parieto-temporal and occipito-temporal regions.
Importantly, research also shows that explicit, structured literacy instruction can build new neural pathways, meaning that early intervention doesn’t just improve reading, it changes the brain’s response to text.
How Is Dyslexia Diagnosed?
Diagnosis is made by a registered, qualified clinical, school, or educational psychologist or speech-language pathologist; a family doctor or pediatrician alone cannot formally diagnose dyslexia unless they have specialist training. Teachers and reading specialists can screen for risk and flag concerns but cannot provide a formal diagnosis. A comprehensive assessment typically evaluates phonological awareness, phonological memory, rapid automatized naming (RAN), single-word reading, spelling, reading fluency, and reading comprehension.
If you have concerns, begin with your child’s teacher or school and request a formal referral if difficulties persist. Early identification (before age 7) is strongly associated with better long-term outcomes.
What Parents Can Do
You are your child’s most important advocate. Research consistently shows that parental engagement is one of the strongest predictors of progress for children with dyslexia.
Trust your instincts. If your student is struggling with reading despite effort, request a formal assessment from the school without delay.
Learn about Structured Literacy: an evidence-based, systematic approach that teaches phonics explicitly and is proven effective for dyslexic learners (endorsed by the International Dyslexia Association).
Read aloud together every day (using audiobooks and e-books with text highlighting) to build vocabulary and comprehension while reducing the reading burden.
Accommodations available to students with a formal dyslexia diagnosis include extended time on tests and assignments, assistive technology (text-to-speech), and oral assessments, which can make a significant difference.
Protect your child’s self-esteem. Many children with dyslexia develop anxiety around literacy; focus on strengths and frame dyslexia as a different way of learning.
Connect with your local chapter of the Learning Disabilities Association of Canada or visit the International Dyslexia Association or the Yale Center for Dyslexia and Creativity for current information. The Ontario Human Rights Commission’s Right to Read report (2022) is an important advocacy tool. It established that access to evidence-based reading instruction is a human rights issue in Ontario, and parents can reference it when advocating with their school board.
Effective Approaches and Interventions
The most robust evidence supports Structured Literacy programs, which include systematic phonics (the direct teaching of the relationships between letters and the sounds they represent), phonological awareness training (which builds a child’s ability to hear and manipulate the individual sounds within spoken words), and explicit morphology instruction (direct teaching of how words are built from meaningful parts such as roots, prefixes, and suffixes). Students must be taught to decode words in an explicit and systematic manner. Approaches like Balanced Literacy or Whole Language, which ask children to use context clues and pictures to guess at words rather than teaching them how to decode text directly, are not effective.
Assistive technology, such as text-to-speech software or speech-to-text dictation, significantly reduces the cognitive load of written tasks. These tools are accommodations, not shortcuts, and their use is widely supported in both education and clinical literature.