15–20%
of the population is affected by dyslexia
Source: International Dyslexia Association
38M
US adults unaware they have dyslexia
Source: International Dyslexia Association
What Is Dyslexia?
Dyslexia is a specific learning disability that affects how the brain processes written and spoken language not a problem with intelligence, vision, or effort.
At its core, dyslexia involves difficulty connecting letters to their sounds a process called phonological decoding. This makes reading slower, more effortful, and less automatic. Spelling, writing, and comprehension are often also affected as secondary consequences.
Dyslexia runs in families if a first-degree relative has dyslexia, the risk increases by up to 50%. It occurs across all languages, cultures, and levels of intelligence, and affects boys and girls at similar rates though boys are more frequently referred for evaluation.
“Dyslexia is a specific learning disability characterized by difficulties in word reading and/or spelling that involve accuracy, speed, or both… causes involve combinations of genetic, neurobiological, and environmental influences that interact throughout development.”
International Dyslexia Association, Official Definition (October 2025)
Phonological Processing Difficulty
The most common underlying challenge difficulty breaking words into their component sounds and connecting sounds to letters.
Neurological Origin
Dyslexia results from differences in how specific brain regions process language identifiable in neuroimaging studies, not a vision or attention problem.
Persists With Standard Instruction
By definition, dyslexia difficulties persist even when general literacy instruction is effective for peers specialist support is required.
Not Linked to Intelligence
Many people with dyslexia have average to superior intelligence. The mismatch between ability and reading performance is a key diagnostic indicator.
Types of Dyslexia
Dyslexia is not one size fits all. Understanding the type helps target the right intervention strategy.
Reading and Decoding (RND)
Measures reading fluency, word recognition, and decoding skills.
Writing and Spelling (WNS)
Evaluates spelling accuracy, sentence formation, and writing ability.
Cognitive Processing and Memory (CPM)
Assesses memory, attention, and cognitive processing performance.
Verbal and Language Comprehension (VLC)
Analyzes language understanding, vocabulary, and verbal reasoning skills.
Signs of Dyslexia Across the Lifespan
Signs change with age early identification at any stage opens the door to effective support.
Early Childhood Signs (Ages 0-5)
Dyslexia can be identified before formal schooling begins. These pre-reading indicators are strong risk signals, especially with family history:
Late talking or learning words slowly
Difficulty learning common nursery rhymes
Trouble recognizing letters in their own name
Confuses words that sound similar (“butterfly” → “flutterby”)
Problems remembering letters, numbers, or colors
Avoids or dislikes rhyming games
Risk Signal Frequency in Pre-Readers
School-Age Signs (Ages 6-12)
Once reading instruction begins, dyslexia becomes clearer. These signs in school-age children warrant prompt screening per Mayo Clinic and IDA guidance:
Reading well below expected level for age
Inability to sound out an unfamiliar word
Difficulty spelling same word spelled differently on the same page
Spending unusually long time on reading/writing tasks
Confusion between letters: b/d, p/q, was/saw
Avoiding reading aloud or reading activities
Strong verbal ability but weak written performance
Challenges in School-Age Children with Dyslexia
Teen & Adult Signs
Dyslexia doesn’t disappear adults often develop coping strategies that mask it. Late identification is common; workplace pressures frequently expose longstanding difficulties:
Slow, effortful reading avoids reading when possible
Difficulty reading aloud or following text during meetings
Frequent spelling errors in emails or documents
Trouble learning a foreign language
Taking much longer than peers on written tasks
Mispronouncing words or struggling to retrieve names
Difficulty summarizing what was just read
Workplace Challenges Reported by Adults with Dyslexia
The Three Phonological Core Deficits
Research from the International Dyslexia Association identifies three core processing weaknesses underlying most dyslexia.
01
Phonological Awareness
The ability to hear and manipulate the individual sounds (phonemes) in spoken words. Difficulty here makes it hard to understand that “cat” has three sounds /k/ /æ/ /t/ and to map them to letters.
Foundation of reading
02
Rapid Automatized Naming (RAN)
The speed at which a person can name familiar items letters, numbers, colors, objects in sequence. Slow RAN is a strong independent predictor of reading fluency difficulties, even separate from phonological awareness.
Reading speed predictor
03
Phonological Memory
The ability to hold sound sequences in working memory while processing language. Weak phonological memory makes it hard to sound out longer words, follow multi-step verbal instructions, and retain what was just read.
Verbal working memory
Dyslexia & ADHD Often Co-Occur
Children with ADHD are significantly more likely to have dyslexia and vice versa. Both conditions affect the same brain systems responsible for language processing, attention, and working memory.
When both are present, ADHD can mask dyslexia symptoms and dyslexia’s reading demands can worsen ADHD-related frustration and avoidance. Screening for one without the other often misses the full picture.
According to Mayo Clinic, “children who have dyslexia are at increased risk of having ADHD, and vice versa” making combined screening essential for a complete picture.
~90%
of children with ADHD also have dyslexia and up to 40% of people with dyslexia show ADHD traits.
1 in 20
hereditary risk if a first-degree relative has dyslexia, a child’s risk doubles. Screening siblings is strongly recommended.
Structured Literacy: The Gold Standard
The IDA endorses structured literacy as the most effective approach for dyslexia and with it, ~95% of children can achieve functional literacy.
01
Break Tasks Into Steps
Large tasks overwhelm executive function. Breaking them into concrete, manageable chunks dramatically lowers the cognitive barrier to starting.
02
Systematic Phonics Instruction
Explicit, sequential teaching of letter-sound correspondences from simple to complex so students can decode unfamiliar words with confidence and accuracy.
03
Multisensory Learning
Engaging visual, auditory, and kinesthetic modalities simultaneously using letter tiles, hand gestures, and sound boxes creates stronger, more resilient neural pathways.
04
Fluency Development
Repeated, guided oral reading builds automaticity moving from laborious decoding to smooth, effortless reading so cognitive resources can shift to comprehension.
05
Vocabulary & Morphology
Teaching the meaningful units of words (prefixes, roots, suffixes) improves both decoding of complex words and reading comprehension simultaneously.
06
Orton-Gillingham Approach
The foundational evidence-based framework behind structured literacy systematic, cumulative, and multi-sensory. The basis for programs like Wilson Reading, Barton, and SPIRE.
Dyslexia Screening & Assessment
From a quick free check to a comprehensive clinician-grade report choose what’s right for your situation.
Free Dyslexia Symptom Screener
A fast, validated questionnaire that identifies likely phonological processing difficulties and reading risk. Ideal for parents, teachers, and self-referral.
- Free no account needed
- Covers key phonological awareness indicators
- Available for ages 5–adult
- Results with explanations in under 10 minutes
- Aligned with IDA and science of reading frameworks
MOST COMPREHENSIVE
Full Dyslexia Assessment
A psychometrically validated assessment measuring phonological awareness, rapid naming, phonological memory, reading fluency, and spelling producing a full diagnostic-grade profile.
- Clinician-designed & validated
- Covers all three phonological core deficits
- Detailed written profile report
- Suitable for school IEP submissions
- GDPR-compliant, fully secure
- PATROL literacy tool included
Dyslexia Myths vs. Facts
Misconceptions delay identification. Here’s what the research actually shows.
Myth
“Dyslexia means seeing letters backwards.”
Fact
Dyslexia is primarily a phonological processing difference not a visual problem. Letter reversals are common in young children generally and are not a defining feature of dyslexia.
Myth
“Dyslexic people are not intelligent.”
Fact
Dyslexia is entirely unrelated to intelligence. Many highly successful people including scientists, artists, and entrepreneurs have dyslexia. It affects the reading process, not cognitive ability.
Myth
“Children will grow out of it.”
Fact
Dyslexia is lifelong. Without targeted intervention, the reading gap typically widens over time. Early, evidence-based structured literacy support is essential waiting rarely helps.
Myth
“Adults can’t have undiagnosed dyslexia.”
Fact
An estimated 38 million US adults have dyslexia without knowing it. Many compensated enough in school but struggle with workplace reading demands. Late identification is common and still highly beneficial.
Myth
“More reading practice will fix it.”
Fact
Generic reading practice doesn’t address the underlying phonological deficits. Only structured, explicit, systematic literacy instruction aligned with Orton-Gillingham principles produces lasting improvement.
Myth
“Dyslexia only affects boys.”
Fact
Dyslexia affects boys and girls at similar rates. Boys are more frequently referred for evaluation often because they exhibit more visible behavioral responses to reading difficulty. Girls are significantly under-identified.
Start Identifying Dyslexia Today
A free screening takes less than 10 minutes and can provide real clarity. Early identification changes outcomes.
