I don't think a che is the same as a halogen but perhaps as a red bulb. There is a lot of guess work at a certain point, or at least that is the way it seems to me. Yes we understand about rod and cone density and what that means to vision and colour. We understand the heat pits and operation and the connection of the nerves, but what they see... they seem to be best guesses. I don't know if there will be any certain facts on that one they are so hard to test.
I have a little one eyed snake (birth defect) and she cannot strike accurately with not completely warmed prey. (short tongue too) but with well warmed prey she is dead accurate and is not dependant of which side it is presented to the eye or no eye.
Books, Ball Pythons barker and barker is a great book basic anatomy and a really thorough over view. There is a great video the inside natures giants python one it is a BBC production. The beauty of snakes is also very good also BBC. F.G. Benedict The physiology of large reptiles, and L Isbell The Fruit, the Tree, and the Serpent: Why We See So Well. Are both good but dense.
I read a lot of journals of zoology there are a number of papers on snake senses over the years. Off hand I'd need to look them up, but they can be a bit dense and hard to get through. I have half a biology degree and still find them a challenge sometimes.
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