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Dyslexia, commonly known in society as “learning disability” or “reading difficulty,” is a neurobiologically based, developmental difference that affects an individual’s skills in fluent reading, accurate word recognition, reading comprehension, and writing. It must be emphasized first and foremost that dyslexia is NOT a vision problem. Having healthy eyes or having vision corrected with glasses does not eliminate dyslexia. Dyslexia is related to how the brain processes language.
However, while making this important distinction, it should not be overlooked that children with dyslexia may simultaneously have some vision disorders, and this situation can make the reading and learning process even more challenging. An existing vision problem can make the act of reading, which a child with dyslexia already struggles with, more tiring and inefficient. Therefore, undergoing a comprehensive eye examination is of great importance for every child diagnosed with dyslexia or experiencing reading difficulty, in order to eliminate possible additional barriers.
We aim to comprehensively assess the eye health of children experiencing dyslexia or reading difficulty, identify whether there are any additional vision-related challenges, and help maximize the child’s learning potential. We will discuss the relationship between dyslexia and vision, which eye problems can affect reading, their symptoms, the diagnosis process, and what can be done in terms of eye health.
Table of Contents
What is Dyslexia?
Dyslexia is characterized by unexpected difficulties in reading, writing, and spelling skills in individuals with normal or above-normal intelligence, who have received adequate instruction, and who do not have a prominent sensory (hearing, vision) impairment. It is fundamentally rooted in a deficit in the phonological (sound system) component of language. Common Symptoms of Dyslexia:
- Difficulty recognizing letters and learning their sounds
- Difficulty reading words fluently and accurately
- Skipping, adding, or reversing letters or syllables while reading
- Slow and choppy reading
- Difficulty comprehending what is read
- Struggling to find rhyming words
- Difficulty with sequencing skills (alphabet, months, etc.)
- Mixing up letters and making spelling errors when writing
- Difficulty learning concepts of direction (right-left) and time
Dyslexia is diagnosed through comprehensive evaluations conducted by specialized educators, psychologists, and speech-language therapists. Ophthalmologists do not diagnose dyslexia; however, they can detect and treat visual problems that might make reading difficult.
The Relationship Between Dyslexia and Vision
For years, there have been misconceptions suggesting a cause-and-effect relationship between dyslexia and vision problems. However, scientific research has clearly established that a fundamental vision disorder does not underlie dyslexia. The eyes of individuals with dyslexia are not structurally or functionally different from those without dyslexia (unless another coexisting eye problem is present). Nevertheless, the following points are important:
- Coexistence: A child with dyslexia, like any child, may have refractive errors such as myopia, hyperopia, astigmatism, or other eye problems like strabismus or lazy eye.
- Factors That Complicate Reading: If a child has both dyslexia and an untreated vision problem, this situation can make the act of reading twice as challenging. For example, if a hyperopic child experiences eye strain during near tasks and already struggles to read due to dyslexia, this combined difficulty may cause them to completely avoid reading.
- Symptom Similarity: The symptoms of some vision problems (especially binocular vision problems and focusing disorders) can be confused with some symptoms of dyslexia (skipping lines while reading, mixing up words, slow reading, avoiding reading). This can lead to misdiagnosis or incomplete intervention.
Therefore, a comprehensive eye examination is essential for every child experiencing reading difficulties to first understand whether an underlying vision problem is contributing to that difficulty. If a vision problem is present, correcting it will not “cure” dyslexia, but it will enable the child to focus more comfortably on reading material and benefit more from special education tailored for dyslexia.
Vision Problems That Can Coexist with Dyslexia
Children with dyslexia, like other children, may have various vision problems. When these problems are treated, reading can become more comfortable.
| Type of Vision Problem | Description and Effect on Reading |
|---|---|
| Refractive Errors (Myopia, Hyperopia, Astigmatism) | Hyperopia (Blurred Near Vision): Causes the child’s eyes to strain more than normal to focus on near objects (books, notebooks). This can lead to eye strain, headaches, getting bored with reading, and distraction. Myopia (Blurred Distance Vision): Causes inability to see the board or distant presentations clearly, but may not directly affect near reading (except for high myopia). Astigmatism (Blurred/Distorted Vision): Can lead to reduced clarity in both distance and near vision, letters mixing up, and eye strain. |
| Binocular Vision Problems (Two-Eye Vision Problems) | |
| – Convergence Insufficiency (CI) | Is the weakness in the ability of both eyes to turn inward (convergence) synchronously when looking at a near target (e.g., book). Can cause symptoms like words jumping/moving while reading, double vision (especially when fatigued), eye strain, headache, difficulty comprehending what is read, and skipping lines. These symptoms are often confused with dyslexia. |
| – Accommodation Disorders (Focusing Problems) | Are problems with the eye’s ability to focus clearly (accommodation) on different distances or sustain that focus. Can reduce reading performance by leading to blurred vision, eye strain, and headache. |
| – Weakness in Fusional Vision Skills | Difficulties in the brain’s ability to combine the images coming from both eyes into a single image. |
| Ocular Motility Disorders (Eye Movement Problems) | During reading, the eyes need to follow the lines smoothly (pursuit movements) and jump quickly and accurately from one word to the next (saccadic movements). Problems with these movements negatively affect reading speed and fluency. |
| Lazy Eye (Amblyopia) | A condition where one eye sees less clearly than the other. Can cause the sighted eye to take on too much load and become fatigued during reading. It can also affect depth perception. |
| Strabismus (Eye Misalignment) | The eyes are not aligned. Can lead to double vision, lazy eye, and visual discomfort, making reading difficult. |
Dr. Semrin Timlioğlu emphasizes that these types of vision problems must be carefully evaluated and appropriately treated in children with dyslexia.
Importance of Eye Examination in Children with Reading Difficulties
If your child has reading difficulties, symptoms of dyslexia, or learning-related challenges, a comprehensive eye examination is crucial for the following reasons:
- To Rule Out or Detect Underlying Vision Problems: To determine if there are any refractive errors, binocular vision problems, or eye diseases that might be contributing to the reading difficulty.
- To Increase Visual Comfort: If a vision problem exists, correcting it can allow the child to feel more comfortable during reading, tire less easily, and maintain attention for longer periods.
- To Pave the Way for Proper Intervention: Once vision problems are ruled out or treated, the effectiveness of special education and other interventions targeting dyslexia may increase. The child can respond better to these programs without a visual barrier.
- To Prevent Mislabeling: Sometimes, a child experiencing reading difficulties solely due to a vision problem may be mistakenly labeled with “dyslexia” or “attention deficit.” A comprehensive eye examination can prevent such confusion.
Warning Signs That Vision Problems May Affect Reading
The following symptoms may indicate that a vision problem is making reading difficult for a child. These symptoms can also be seen in conjunction with dyslexia:
| Symptom Area | Observable Signs |
|---|---|
| Behaviors During Reading | Holding the book or text too close to the eyes. Frequently losing place while reading, needing to track with a finger. Skipping lines or words, rereading the same word. Stating that letters or words are mixing up (like b, d, p, q; or was/saw). Tilting the head to one side or closing one eye while reading. |
| Eye Strain and Discomfort Symptoms | Eye fatigue, pain, burning, stinging, or watering, especially after reading or near work. Frequent eye rubbing or blinking. Headaches (especially in the forehead and temples). Sensitivity to light. |
| Reading Performance and Attitude | Reading noticeably slower than peers. Difficulty comprehending what is read (due to distraction caused by visual difficulties). Avoiding reading or homework that requires near work; reluctance towards such activities. Short attention span (especially during reading). |
| Other Visual Signs | Visible eye misalignment (strabismus). Frequent squinting when looking. Extreme difficulty copying text from the board or a book. Stating that they see double. |
If one or more of these symptoms are present in your child, it is recommended that you contact a pediatric ophthalmologist.
Ophthalmological Assessment in Children with Dyslexia
Dr. Semrin Timlioğlu performs the eye examination for children diagnosed with dyslexia or experiencing reading difficulties, taking their special needs into consideration. This examination includes:
- Detailed History Taking: Information is gathered from the family about the child’s developmental history, the onset and nature of reading difficulties, school performance, and any other existing health problems.
- Visual Acuity Tests: Distance and near visual acuity for each eye are measured using age-appropriate methods.
- Cycloplegic (with Drops) Refraction Examination: This is an objective measurement performed after dilating the pupils with drops to accurately and completely determine refractive errors (myopia, hyperopia, astigmatism) in children. This is critically important for revealing hidden hyperopia.
- Assessment of Binocular Vision Functions:
- Eye Alignment: Checking for strabismus (eye misalignment).
- Convergence Ability: Measuring the capacity of the eyes to turn inward when looking at near objects.
- Accommodation (Focusing) Ability: Testing the eye’s skill in focusing clearly on different distances and sustaining that focus.
- Stereopsis (Depth Perception): Evaluating the ability to see in three dimensions.
- Fusional Vision Skills: Examining the brain’s capacity to merge the images coming from the two eyes.
- Ocular Motility (Eye Movements) Assessment: Evaluating the quality and coordination of the eye’s pursuit (tracking) and saccadic (jumping) movements.
- Eye Health Examination: Checking the health of all eye structures through biomicroscopy and fundus examination.
Vision Rehabilitation in Children with Dyslexia
If a vision problem that may affect reading is detected in a child with dyslexia, the goal is to treat this problem appropriately:
- Eyeglass Prescription: If refractive errors (myopia, hyperopia, astigmatism) are present, glasses with the correct prescription are provided. This can help the child see letters and words more clearly, reduce eye strain, and feel more comfortable during reading.
- Vision Therapy (Orthoptic Treatment): This is a very effective treatment method for convergence insufficiency, accommodation disorders, certain eye movement problems, and other binocular vision issues. Vision therapy is a program planned and applied by the ophthalmologist or orthoptist, aiming for the eyes to work together more efficiently, strengthening focusing skills, and increasing visual comfort through special exercises.
- Strabismus and Lazy Eye Treatment: If these conditions are present, appropriate treatment methods (glasses, patching therapy, prisms, surgery, etc.) are planned.
Important Note: These treatments do not “cure” dyslexia. However, by eliminating additional burdens on the child’s visual system, they make the act of reading less tiring and allow the child to benefit to the maximum from specialized educational programs and strategies for dyslexia.
Dyslexia is primarily a language-based learning difference and does not stem from vision problems. However, a healthy visual system is a fundamental requirement for every child to utilize their learning potential optimally. For children with dyslexia or reading difficulties, detecting and correcting any underlying vision problem can provide significant relief and support in their educational journey.
If your child has dyslexia or is experiencing difficulties with reading and learning, you can consult Dr. Semrin Timlioğlu for a comprehensive eye health assessment. We aim to contribute to your child’s learning adventure in the best possible way by optimizing their eye health.
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