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Re: [OM] Tetrachromacy

Subject: Re: [OM] Tetrachromacy
From: Chris Barker <ftog@xxxxxxxxxxxxxx>
Date: Wed, 31 Oct 2018 18:02:30 +0000
So you have more rods than most at the fovea, Chris?  Or perhaps your blind 
spot is slightly differently placed in each eye, giving you overlap – like the 
optic nerve blind spot.

Chris

> On 31 Oct 2018, at 14:41, Chris Trask <christrask@xxxxxxxxxxxxx> wrote:
> 
>     I must have a very high number of rods, as my night vision is well above 
> average.  I also do not seem to have a night "blind spot".
> 
>> 
>>> It’s interesting to me because I lecture on vision as part of my job, 
>>> and to day I’ve spoken only about rods and cones (and photo-sensitive 
>>> ganglion cells), never about the 3-colour properties of most people’s 
>>> cone cells.  And now I know that there are people with 4-colour cells.
>> 
>> 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.
>> 
> 
> 
> Chris

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