Don't just consult Dr Google' for your child's worrying behaviour

But some behaviours can be more worrying than others, and it is hard to know when to call on professional help.

Psychologist and neuroscientist Charlotte Keating said it was understandable that parents were sometimes reticent to take their child to see a therapist.

"There's that fear that you'll make it a bigger problem if you treat it as a problem," she told ABC Radio Melbourne's Clare Bowditch.

Back to school: Know the signs it is time to get your child's eyes tested

Andrew Hogan of Optometry Australia sees a lot of children in his practice in Hobart, often when parents or teachers notice one of those symptoms.

"Kids won't complain about blurry vision," he told Helen Shield on ABC Radio Hobart.

"Kids who aren't paying attention [in class], sometimes it's simply because they can't see and they don't realise that everyone else can see, because they've got nothing to compare it to."