Interesting, Ken. I’ve always briefed that the rods are not completely
monochrome, but that they are deficient in colour perception compared with the
cones.
If you experiment by using your rods (in light less than bright moonlight, for
instance, you might be able to determine which colour you can detect.
Yes, the article, “Colour Vision” on BBC Radio 4 (in case you ever come across
it) reminded me that how each of us perceives colour (not color) could be quite
different.
Chris
> On 29 Oct 18, at 18:33, Ken Norton <ken@xxxxxxxxxxx> wrote:
>
> Several years ago I did quite a bit of research into this. The people
> with four-color (not colour) cones are rare enough to not be
> considered part of the normal human race. :) HOWEVER, there are
> people who have rods with some pigment.
>
> It's pretty fascinating that the human eye does not actually "see"
> red. The red cones see a wide band of color from red down to yellow.
> This band is overlapped by the green cones. To determine "red", the
> human vision system sees the absence of green. So if the eye sees
> green and red, it's actually yellow/orange. If it sees red but not
> green, then it's actually red.
--
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