[AZ-Observing] Re: Telrad stellar limit

The after image almost certainly has little to due with pupil size.
The pupil adapts rapidly to light. The chemical bits that really do
most of the heavy lifting of dark adaption are much slower. 

So if you blow out one eye with bright light, it may (or may not, I
don't know) make both pupils shrink. But the chemical bleaching of
rhodopsin is what will affect one eye for a considerable amount of
time (and not the other eye). 

Joe


--- "Wayne  (aka Mr. Galaxy)" <mrgalaxy@xxxxxxxx> wrote:

> 15480 Empire Rd.
> Benson, AZ 85602
> hm ph: 520-586-2244
> That may be so for dim objects, Brian, but when you look at the
> moon (say) through the eyepiece of a telescope and then withdraw
> your eye, only the one doing the observing is affected. The other
> eye is still relatively dark adapted. It would be interesting to
> see how the irises of both eyes compare after that observation.
> Certainly, only the one eye that did the observation has the
> after-image! 



      
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