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How about weird science? I do weird science and try to do weird science every day. First, throw out reflectance. Go down your animal inventory list, including yourself because humans have eyeshine. Look at the shape of the eyes and shape of the pupils. Round eyes, elongated eyes. Round pupils, vertical slits, horizontal slits. How fast do animal pupils react? Humans have eyeshine and our pupils react very fast. Have you been the victim of 'red eye' in flash photography? The 'pre-flash' was developed to minimize red eye. The pre-flash emits enough light before image capture to make our pupils react and close down. Forget reflectance. Using human vision to make wild ass guesses about Sasquatch vision is speculative. Human color perception is subjective. I am game. Primate evolution is assumed. Night vision, scotopic, is without color and done with rods. Day vision, photopic, with color, is done with cones: red, green and blue. Rods have peak sensitivity of about 498nm, in the green-blue region. Red cones have a range of about 500nm--700nm, with peak sensitivity about 564nm--580nm. Green cones have a range of about 450nm--630nm, with peak sensitivity about 534nm---555nm. ( hint hint hint notice I am not listing the blue cone ). Photons hit the retina and electrical impulses are created. There is a delay between the impulses and they do not arrive at the vision processing areas simultaneously. The delay in signals is 10s of milliseconds but it all comes together to make images. Cones and rods operate in an 'on-off' scenario to send signals. There are several different channels used to send signals. Red-green use one channel. Blue-yellow use a separate channel. The rod channel, black and white, is the luminance channel. Our visual signals are pulsed. This brings up 'critical fusion flicker frequency'. Anyone have trouble with flickering flourescent lights? I have not seen projected light. I am aware of red and green light. Is the light pulsed? If pulsed, and the rate is higher than the critical fusion flicker frequency then humans would see a continuous light. I am thinking that the rod cones aren't firing when the projected light occurs. If there is over lap, the luminance channel is separate from the red-green channel. Alternating visual signals and light emitting signals. The retina can generate its own flourescence. The deepest layer of cells of the retina are called 'retinal pigment epithelium', ( RPE ) and contain flourescent compounds. Weird science never rests. CAT I reviewed emails. So far, time of illumination is less than a minute.

And I will also respectfully disagree. You don't have a basis other than your pre-existing assumptions for inclusion or elimination. That will never gain you anything you don't already assume you know. Gotta step back far enough to see what might also be relevant before you can learn anything you don't already know. Bottom line .. if the eyes do indeed produce some sort of glow which is not merely reflection, then you should be able to make some guesses about the sort of receptors needed to make use of that "glow." Overlooking that angle reduces your chances of arriving at any correct conclusions about the receptors. There is decent empirical evidence in the body of reports to suggest that they see a) deeper into infared, b) deeper into ultraviolet, and c) in color .. which generally are not found together .. than we do. It is very possible that a larger eye structure provides physical space for all of the specialized structures to exist simultaneously rather than selectively as our smaller eyes require. I suggest that projecting our limitations onto them, without considering the possibilities that larger eyes present, is .. naive. We don't have anything but our possibly flawed assumptions to back that choice up with. Since we are already confronted by things here that seem to defy expectations, further trapping ourselves within those expectations is not very insightful. MIB

Moonless night and I saw unmistakable green and sometimes sparkly green eyeglow from 25 ft. (was totally dark adapted too in expectation of a possible encournter), , moreover, as the subject turned head on shoulders or rotated shoulders with head the glow could be seen from an angle as well as head-on. Other elements of that particular sighting and visual phenomenon observed probably not cogent for this thread or discussion herein but suffice it to say they can generate light from eye structures whatever the color and without ambient light sources available for reflectivity or red reflex retinal explanations. Animal, vegetable or mineral it is what I unmistakably witnessed.

What I saw were not eyes reflecting red, but glowing red. Unless a moon just rising could cause reflection. On the topic of color - bird's feathers show the effect of carotenoids in their diet. For instance, around here male house finches can look from dark red to yellow - and all in between - depending on the berries, primarily, that they consume. Which depends on season and availability. Other things cause darker or lighter beaks, and dark feathers, that change seasonally. Maybe the bigfoot I saw ate a whole bunch of dried berries.