Scientific discussion of retinal photoreceptors and animal vision

Scientific discussion of retinal photoreceptors and animal vision The text contains only biological explanations about eyes and vision with no mention of political figures, financial transactions, or misconduct. It offers no actionable investigative leads. Key insights: Human retina contains ~120 million rods and 7 million cones.; Frogs may react to single photons, but not proven.; Tapetum lucidum gives some animals a reflective eye layer.