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I heard this in the 70s thought it was quite well known. I was under the impression that the time to achieve chemical dark adaption increased as one got older but your info does mention that. Perhaps that is just an excuse for us old fellows to be more grumpy about light trespass, seeing as how we believe we have put more time into getting dark adapted. Looks like I should give up on cups of tea while observing and drink berry juice instead.
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