eye color - changing with mood

[Clemens Suter-Crazzolara]

> First, I do not believe that the iris changes.  I know that it is
> sufficiently invariant that it can be used for biometric identification to
> the extent of 1x10**34 or better.  There are patents on this and a new
> company in NJ exploiting this fact.
> 
1x10E34 ??? that is extremely sensitive and hard to imagine ! What is this
biometric identification ? 

> Perhaps the perceived difference is the iris against a changing
> background, e.g. the lids and adjacent skin surfaces.  A person is said to
> be "blue" for a reason; the blood pressure is lower .... often
> dramatically ... when depressed.  Conversely, the b.p. is very high and
> the skin is flushed when aroused.  This would be most pronounced in
> Caucasians and would be apparent most readily with green/blue/hazel/gray
> eyes.
> 
> What do you think?  Plausible?  I would be pleased to help do the
> experimental on this ... especially the high blood pressure portions.
sounds plausible.