Posted: Sep 05, 2012 2:54 pm
DavidMcC wrote:Adco, bear in mind that the visible threshold described in your Wiki link is about light levels that are orders of magnitude lower than the levels that enable the cone cells in the fovea to fire at a "visible" rate. We do not normally see single photons, because there is usually enough random background neuron firing to disguise such flashes.
I realize that. It's just interesting, that's all.