Invisible wrote:

> 
> The human eye features two systems for adapting to light levels. One is 
> the iris, which can adjust the amount of light that enters the eye. But 
> in really low-light conditions, a second set of light receptors in the 
> retina which respond to much lower light levels. (And don't distinguish 
> colour. That's why in the dark, everything seens monochrome.)
> 

Yes. But, interestingly because of the chemistry of the eyes, it takes 
quite a while before night vision is effective.

> 
> Likewise. I can also adjust the convergence...
> 

So can I. As a teenager I got swept up in the whole stereogram thing. I 
used to look at pages and pages of them, and eventually went to try my 
own. Then I went for a vision test to renew my drivers license. I 
couldn't seem to match the center set of numbers normally, it actually 
took me a couple tries before I could get it right.

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