Datacolor User to User Support Group.

David et al.,

> These may indeed not be the causes, but they are not ridiculous items the
> check: not a week goes by that one or the other of them is the solution to
> someone's color matching issues...

I've been through this - had two lenses replaced with 6 months in between 
which allowed plenty of time for experiments. The color perception with my 
natural lens looked like the artificial one with a .15CC yellow filter in 
front of it. With my old natural lenses I used to prefer blue-tinted 
sunglasses; now I prefer yellow-tinted sunglasses.

Lenses start going yellow very early in life; anyone over about 40 will 
notice the difference, and by the time people start getting cataracts which 
also blur their vision, the yellowing is quite pronounced. When I came out 
of the operating theatre, I was surprised to see that the nurses uniforms 
were light blue according to my new lens. When I went into the op theatre, 
they were gray! - and still were with the remaining old lens.

Some of the artificial lens manufacturers are now making yellow lenses. It 
seems that the yellowing with age may have some protective effect on the 
retina.

But as you say, it has a big effect on color vision. Most people just don't 
realise it.

Bob Frost.

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