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I'm going to delete this material on the grounds that it can't be fixed. It contains a great number of factual errors.
Threshold cannot be determined on perfect sensation or lack thereof, due to fluctuations in the threshold. Thus, there is no set brightness seen by the viewer, and no intensity just lower than this that no flash is seen. To activate a bipolar, multiple rods must be stimulated, e.g., as 1940’s experiments have determined, that eleven quanta, one for each single rod, is necessary to trigger light perception. Another experiment shows that a 60 percent frequency may represent 2,500 quanta, one per rod, among a patch of 2 million rods. Therefore only one rod out of many is perceived at the threshold, and in a short stimulus, rods cannot absorb more than a single photon of light. (A quantum or photon is stated as Planck's constant and the frequency of light.)
02:43, 29 October 2008 Nuvitauy07
Fluctuations in retinal response are driven by fluctuations of the amount of energy of the stimulus and not the change of retinal sensitivity. For example, if an average number of photons is given, the actual quantum content received and frequency of vision are similar.
I think the article is now in good enough shape that it doesn't need the expert tag at the top. Zyxwv99 (talk) 23:54, 12 October 2014 (UTC)
Five days have gone by and there have been no replies. I'm going to remove the expert tag. If someone still has issues, feel free to discuss them here. We can always put it back if, or use lower-level tags as needed. Zyxwv99 (talk) 13:13, 17 October 2014 (UTC)