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Over the years I have encountered some half dozen
red-green colour-blind adult males while teaching geological map interpretation.
Two of them (both of post middle-age) were completely unaware that they were
colour-blind at all until they found difficulty in discriminating between very
subtly different colours on maps and, later, checked themselves out
using Ishihara-type colour dot-pattern charts ***. As I understand it, there are
degrees of (or variations in) colour blindness. Some are but slightly
affected, others more so. How then would it be possible, desirable, fair,
advantageous or even legal to have a ruling preventing a colour-blind
person from orchid judging? Am I correct in my belief that almost all
colour-blindness is not 'grey scale' .
Maybe a colour blind member of this forum could
make his views known. I believe that the phenomenon is mainly
sex-linked and that female colour blindness is very rare, but again,maybe an
appropriate expert member could put me right?
John Stanley
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