Children’s behaviour issues often mask undiagnosed eye problems, experts warn

Parents are urged to consider eye health assessments for children displaying signs of concentration difficulties, as undiagnosed vision issues may be mistaken for behavioural problems and can hinder learning.

As children settle back into the school routine, some parents may mistake signs such as fidgeting, daydreaming or careless mistakes for poor behaviour, when the problem could be eyesight. Optometrist groups and eye-health specialists say children often do not realise they have a vision issue because that is how they have always seen the world, so they may simply switch off in class instead of complaining. The Association of Optometrists says undiagnosed sight problems can affect concentration, learning and behaviour.

Chien Wong, a consultant ophthalmologist at OCL Vision, said some children can pass a standard eyesight check in each eye but still struggle to make both eyes work together properly. That can happen with conditions such as convergence insufficiency, where the eyes have difficulty teaming up and tracking smoothly across a page. The result may be blurred or “swimming” text, which can make reading tiring and schoolwork harder to complete.

The NHS says children in the UK are entitled to a free sight test until the age of 16, or until 19 if they are in full-time education. Government guidance in England also recommends a vision screening around the age of four to five, but that check is mainly designed to pick up reduced vision in one or both eyes, not every focusing problem that can emerge later as reading becomes more demanding.

Parents are being urged to treat eye checks as an early step if a teacher raises concerns about concentration or if a child avoids reading and writing. Warning signs can include headaches after school, clumsiness, sitting very close to objects or struggling to follow text. The NHS and related guidance say many childhood vision problems are treatable if they are found early, which is why a routine eye test can be a quick way to rule out a medical cause before behaviour becomes the main explanation.