Parents should make sure any signs of troubled eyes in their children are seen by a doctor or optician as soon as possible, a contact lens manufacturer says.
Cooper Vision, makers of Proclear One day and Bioinfinity says a quarter of children have eye problems that go undetected between the ages of five and 12.
Kids cannot judge whether there is anything wrong with their sight themselves, it stated.
Cooper Vision has put together a list of symptoms parents can look out for.
These include squinting, rubbing or blinking the eyes a lot; having trouble seeing the blackboard at school; using a finger as a place mark when reading; and holding reading materials close to their face.
Having red or crusty eyes could also be a sign that something is wrong.
On its website, the company states: "It is recommended that all children have their eyes examined at four years old.
"If there is a family history of eye conditions, it is recommended their eyes be examined by the age of three."
Children who are older can wear contact lenses as long as they can understand and follow the manufacturer"s safety and hygiene instructions.
by Adrian Galbreth