Re: people/blue eyes

[Geoff McAuliffe <mcauliff@xxxxxxxxx>]

Clive Warren wrote:

> >Clive Warren wrote:
> >
> >> >Does anyone have experience with IR photography of darker
> >> >skinned(non-caucasian) people:  Do you still get a "glow" effect around the
> >> >person?  Why do blue eyes end up with a "bizarre" look and brown eyes
> >> >generally turn out fairly normal?  Also, has anyone successfully used a
> >> >Pentax ZX for IR photography?  Pentax said the entire ZX series would have
> >> >potential leak problems/leaks through the back-
> >> >--
> >> >---
> >> >Michelle Lord <theelords@xxxxxxxxxxxxx>
> >> >
> >>
> >> Hi Michelle,
> >>
> >> The blue eye effect is related to the fact that us blue eye types do not
> >> have any pigment in our retinas.
> >>
> >> My friends tell me that people with blue eyes are bizarre anyway.......
> >>
> >> All the best,
> >>
> >>               Clive   http://clive.bel-epa.com
> >
> >Clive et al:
> >
> >    Blue-eyed people may be bizarre but they do have pigment in their retinas
> >and  in their irises (the colored part of the eye). Blue-eyed persons do have
> >less pigment in their irises than do those with brown eyes.
> >
> >Geoff
> >--
> >**********************************************
> >Geoff McAuliffe, Ph.D.
> >Neuroscience and Cell Biology
> >Robert Wood Johnson Medical School
> >675 Hoes Lane, Piscataway, NJ 08854
> >voice: (732)-235-4583; fax: -4029
> >mcauliff@xxxxxxxxx
> >**********************************************
> >
>
> Hi Geoff,
>
> There we are, told you so ;-)
>
> Thanks for the medical explanation - knew there was some pigment in there
> somewhere - fought against using the term iris mentally for at least a
> nanosecond when I posted.
>
> My bizarre nature forced me to post a reply with total non-recall of those
> physiology classes :-)
>
> How about some physiological explanation of Michelle's experiences
> photographing blue eyes with IR?

    Well, if blue eyes turn out very pale on a print then I would guess that they
reflect a lot of IR radiation, just like deciduous foliage. Similarly, (the
additional pigment in) brown eyes would be absorbing such radiation. I'll kick this
around with an ophthalmologist I know.

Geoff
--
**********************************************
Geoff McAuliffe, Ph.D.
Neuroscience and Cell Biology
Robert Wood Johnson Medical School
675 Hoes Lane, Piscataway, NJ 08854
voice: (732)-235-4583; fax: -4029
mcauliff@xxxxxxxxx
**********************************************


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