When a child struggles with reading, concentration or seems clumsy or easily frustrated, vision isn’t always the first thing parents think of. But sometimes the cause is BVD in children — binocular vision dysfunction, a condition where the eyes don’t work together quite as they should. Because it isn’t about how clearly a child can see, it’s easily missed, and its symptoms are often mistaken for a learning or behavioural problem.

What Is Binocular Vision Dysfunction?

Binocular vision dysfunction happens when the two eyes are slightly misaligned, so the brain has to work harder to pull their two images into one clear, comfortable picture. That constant extra effort can cause headaches, tired eyes, difficulty concentrating and problems with reading — especially in children, whose visual system is still developing and who spend their days reading, writing and looking at screens.

Why BVD Is Often Missed in Children

A standard school screening or basic eye test mainly checks how clearly a child sees — whether they need glasses for short- or long-sightedness. BVD is different: it’s about how well the eyes team together, which those quick checks don’t assess. A child can pass a standard vision screening with “20/20” eyesight and still have binocular vision dysfunction. It also takes a specific functional vision assessment to detect it.

Children rarely report the problem, too — they assume everyone sees the way they do, so they simply avoid the tasks that feel hard.

7 Signs of BVD in Children

Watch for these signs, particularly if they appear together or around reading and schoolwork:

  1. Losing their place when reading, skipping lines or re-reading the same line.
  2. Avoiding reading or homework, or tiring quickly when they do it.
  3. Frequent headaches or sore, tired eyes, especially after school or screen time.
  4. Difficulty concentrating, a short attention span, or becoming frustrated with close work.
  5. Covering or closing one eye, or tilting the head, to see more comfortably.
  6. Clumsiness or poor coordination — bumping into things, or difficulty with catching and ball sports.
  7. Motion sickness or dizziness, in the car or on screens.

 

Not sure if it’s worth checking?

Thinking about your child, take our quick BVD self-check — tick any signs you’ve noticed and see whether it’s worth booking an assessment.

Could It Be BVD? A Quick Self-Check

Binocular Vision Dysfunction (BVD) happens when the eyes struggle to work together. Tick any symptoms below that you've noticed with no clear reason. This is an awareness tool, not a diagnosis.

Comfort

Balance & movement

Reading & focus

And

This self-check is for general information only and is not a medical diagnosis. Your answers are not stored or sent anywhere. Only a comprehensive assessment can determine whether BVD is present. If you're experiencing sudden or severe symptoms, please see a doctor.

The Link With Reading, Learning and Behaviour

Because the symptoms of BVD — poor focus, reading avoidance, restlessness and frustration — overlap with those of learning difficulties and attention problems, children with binocular vision dysfunction are sometimes assessed for other conditions first. Research has increasingly explored the connection between binocular vision problems and reading difficulty in children, which is why it’s worth ruling out a vision cause when a child is struggling. Checking a child’s binocular vision won’t replace other assessments, but it can be an important and often-overlooked piece of the picture.

How BVD in Children Is Assessed

At Adelaide City Optometrist, we assess how a child’s eyes work together through a dedicated functional vision assessment — going well beyond a standard eye test. If you’d like to understand the condition further, our guide to the signs of binocular vision dysfunction explains what to look for. This includes tests of eye alignment, eye-teaming and eye movement, so we can build a full picture of how comfortably your child’s eyes work as a pair before recommending anything.

How BVD Can Be Helped

BVD is very manageable once it’s properly identified. Depending on what the assessment finds, options can include precisely prescribed lenses (including prism, where appropriate) to ease the strain of misalignment, and vision exercises to help the eyes work together more comfortably. We’ll talk you through what’s most suitable for your child.

 

Worried About Your Child's Vision?

If reading, concentration or headaches are making school harder for your child, a functional vision assessment can help find out why. We'll check how their eyes work together, not just how clearly they see.
BOOK A CHILDREN'S EYE TEST

Frequently Asked Questions

Can a child pass a normal eye test and still have BVD?

Yes. Standard tests check how clearly a child sees, not how well their eyes work together. A child can have perfect "20/20" eyesight and still have binocular vision dysfunction, which is why a dedicated functional vision assessment is needed to detect it.

Is BVD in children the same as a learning disability?

No. BVD is a vision condition, not a learning disability — but because its symptoms (reading difficulty, poor concentration, frustration) can look similar, it's worth checking a child's binocular vision as part of understanding why they're struggling.

At what age can a child be assessed for BVD?

Children can be assessed once they're able to reliably respond during testing. If you've noticed the signs above, book an appointment and we'll advise whether an assessment is appropriate for your child's age.

How is BVD in children treated?

Management depends on the individual assessment, but may include specially prescribed lenses (including prism where appropriate) and vision exercises to help the eyes work together more comfortably.