>     The dark adapted eye can resolve a single photon.


IIRC, the analysis was something like "humans can detect optical events with
greater than statistical probability at light levels that are estimated to
only provide a very small number of photons (<10) to the optical receptors
(corresponding to some greater numbr of photons in the actual event.")

That's pretty impressive, but it's not quite what I'd call "perceiving"
or even "resolving" single photons.

BillW

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