Dyslexia is a specific learning disability that makes it hard to read words accurately and fluently, to spell, and to decode new words. It is brain-based and usually comes from trouble with the sound structure of language, such as breaking words into their individual sounds and linking those sounds to letters. Dyslexia is not a sign of low intelligence, laziness, or poor vision, and it does not mean a person sees letters backward. With the right instruction, people with dyslexia can learn to read well.
What is dyslexia?
The International Dyslexia Association (IDA) describes dyslexia as a specific learning disability that is neurobiological in origin. In plain terms, the IDA definition says:
- People with dyslexia have trouble with accurate and/or fluent word recognition, and with spelling and decoding.
- These problems usually come from a weakness in the phonological (sound) part of language.
- The difficulty is often unexpected, given the person's other abilities and the effective teaching they have received.
- Secondary consequences can include weaker reading comprehension and less reading experience, which can slow the growth of vocabulary and background knowledge.
Dyslexia is the most common learning disability. It exists on a continuum of severity, from mild to severe, and it is lifelong. A person who is dyslexic can still have strong oral language, reasoning, and creative skills. It often occurs with other conditions, such as ADHD, dysgraphia (a writing disability), or dyscalculia (a math disability).
Signs of dyslexia by age
Dyslexia symptoms look different at different ages. No single sign proves a child has dyslexia, but a pattern of several signs that lasts over time is a reason to ask for an evaluation.
Preschool and kindergarten
- Late talking or mispronouncing familiar words long after peers
- Trouble learning and remembering letter names and letter sounds
- Difficulty with rhyming or clapping out syllables
- Trouble learning common sequences, such as the alphabet or days of the week
- A family history of reading problems
Elementary school
- Slow, effortful reading and guessing at words instead of sounding them out
- Trouble with decoding new words and remembering sight words
- Spelling that is far below grade level or spells the same word different ways
- Avoiding reading aloud, or complaining that reading is hard
- Strong listening comprehension compared with reading comprehension
Middle school, high school, and adults
- Reading slowly and needing to reread text to understand it
- Persistent spelling problems and difficulty with written expression
- Trouble learning a foreign language
- Running out of time on tests and needing much longer for homework
- Avoiding reading for pleasure
Many children with dyslexia also feel frustrated or anxious about school, and repeated failure can hurt self-esteem and psychological well-being. Noticing strengths, such as creativity, verbal reasoning, or problem-solving, matters as much as noticing weaknesses.
What causes dyslexia?
Research shows that dyslexia is linked to differences in how the brain processes language. Brain imaging studies have found that people with dyslexia tend to use the left-hemisphere reading networks differently from typical readers. The core problem for most people is phonological processing: noticing and working with the individual sounds (phonemes) in spoken words. If a child cannot easily hear that "cat" has three sounds, it is harder to map those sounds to letters.
Dyslexia also runs in families. A child with a parent or sibling who has dyslexia has a higher chance of having it, and genetics plays an important role. Dyslexia is not caused by vision problems, poor parenting, or a lack of effort, and it is not something children simply outgrow.
How dyslexia is evaluated
Early screening in kindergarten and first grade can flag children at risk. Many states now require dyslexia screening in the early grades. A full evaluation can be done by the school's evaluation team or by a qualified private professional, such as a psychologist or neuropsychologist. Under IDEA's Child Find duty, schools must evaluate children they suspect may have a disability, and parents can request an evaluation in writing.
A dyslexia evaluation usually looks at:
- Phonological awareness and phonological memory
- Rapid naming of letters, numbers, or objects
- Word reading and nonsense-word decoding
- Reading fluency and reading comprehension
- Spelling and written expression
- Oral language and vocabulary, often with input from a speech-language pathologist
- Cognitive ability (often an IQ test), vision, and hearing, to rule out other causes
Schools may use data from Response to Intervention (RTI), but IDEA does not allow RTI to delay or deny an evaluation. If parents disagree with the school's results, they can request an independent educational evaluation.
Structured literacy and Orton-Gillingham instruction
Children with dyslexia learn best with structured literacy. This approach teaches reading in a way that is explicit, systematic, cumulative, and diagnostic. Skills are taught directly, one step at a time, in a logical order, and each lesson builds on the last. Teachers check progress often and adjust instruction.
Structured literacy covers phonology (the sounds of language), sound-symbol association (phonics), syllables, morphology (prefixes, roots, suffixes), syntax (sentence structure), and semantics (meaning). Many programs are based on the Orton-Gillingham approach, which is multisensory: students see, say, hear, and write sounds and words, sometimes using movement or touch to reinforce learning. Examples of Orton-Gillingham-based programs include Wilson Reading System and Barton, among others. No single brand works for every child; what matters is that instruction follows structured literacy principles and is delivered with enough intensity.
Accommodations for dyslexia
Instruction builds skills, while accommodations give access to learning while those skills grow. Common accommodations include:
- Extended time on tests and assignments
- Audiobooks, text-to-speech, and speech-to-text software (assistive technology)
- Having tests read aloud, except when reading itself is being tested
- Reduced copying from the board and access to teacher notes
- Not being graded down for spelling on assignments that are not spelling tests
- Not being asked to read aloud in class without warning
Dyslexia under IDEA and Section 504
IDEA names dyslexia in its definition of a specific learning disability (SLD). A child with dyslexia who needs specially designed instruction can qualify for special education and an IEP. In 2015, the U.S. Department of Education reminded schools that nothing in IDEA prevents them from using the term "dyslexia" in evaluations, eligibility decisions, and IEPs.
A student with dyslexia who does not need special education may still qualify for a Section 504 plan, because dyslexia can substantially limit reading and learning. A 504 plan provides accommodations and equal access. Section 504 and the Americans with Disabilities Act (ADA) also protect people with dyslexia in college and at work.
Famous people with dyslexia
Many successful people have talked openly about their own dyslexia. Their stories show that reading struggles do not define a person's future.
- Whoopi Goldberg, actor and talk show host, has spoken about struggling in school and later learning she had dyslexia.
- Henry Winkler, actor, was diagnosed as an adult. He co-writes the Hank Zipzer children's books about a boy with dyslexia.
- Richard Branson, founder of the Virgin Group, has written and spoken about his dyslexia and his difficulties at school.
- Octavia Spencer, Academy Award-winning actor, has said she has dyslexia and has talked about how it affected her as a student.
- Steven Spielberg, film director, was diagnosed with dyslexia as an adult and has described being bullied and falling behind in reading as a child.
Frequently asked questions about dyslexia
What are the first signs of dyslexia in children?
Early signs include late talking, trouble learning letter names and sounds, difficulty with rhyming, and a family history of reading problems. In early elementary school, slow and inaccurate reading and poor spelling are common signs.
Does dyslexia go away?
No. Dyslexia is lifelong, but it is very treatable. With early, structured literacy instruction, most children with dyslexia can learn to read accurately, and accommodations help them keep up with grade-level learning.
Is dyslexia a form of autism?
No. Dyslexia and autism are separate conditions. A person can have both, but dyslexia is a specific learning disability that mainly affects reading and spelling.
Do people with dyslexia see letters backward?
Not usually. Many young children reverse letters like b and d while learning to read. Dyslexia is mainly a problem with processing the sounds of language, not with seeing letters.
At what age can dyslexia be diagnosed?
Signs and risk factors can be identified as early as preschool or kindergarten through screening. A formal diagnosis is often made once a child has had some reading instruction, commonly around first or second grade, but it can be made at any age, including adulthood.
