I have just discovered that my 9 year old is colour blind quite a shock really. I was doing his homework and he asked me if the pencil was blue or purple. I had suspected it for a while as my father is colour blind. We then tested him with the on-line tests and he was positive for all the tests. Surprisingly in one of the tests he could see the bottom half of the star and not the top. Does anyone know of a behavioural optometrist in the centre of London? I think I would like him assessed