1. A major problem arises from the persistent and inappropriate use of the term ‘colour blindness’. Colour blindness, as we all know, is extremely rare, but the impression is given, by those who ought to know better, that a large number of people, predominantly male, have a serious problem. In reality, such people, until tested, are unaware of any shortcoming and experience no difficulty with colour identification in any normal activity.

2. Mankind is the only species using red as the danger signal; all others use yellow or yellow and black; red usually indicates lunch.

3. In my experience, a colour vision deficiency is often offset by having substantially better than average night vision; a far more valuable asset but, because it is not ‘normal’, the establishment seems to have difficulty handling it. Night vision ought to be tested in conjuntion with colour vision when assessing a candidate’s suitability for navigation at sea or in the air at night. I have not so far come across anyone with ‘normal’ colour vision whose night vision is not, in my view, poor.

Thank you for your time.

Kind regards,

J.G.