rods and cones
"The rods and cones are like antennas on old TV sets, and if these antennas are broken, you don't get a good picture on the TV," he explained. "So if enough rods and cones degenerate, then vision quality and center vision goes down."
"Rods and cones are like giant radio telescopes, huge structures that can still gather signals on the very threshold of physical existence"
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