Duplex retina

Imagine your eye as a building with two floors. The bottom floor is where all the action happens: it's where the light gets turned into signals your brain can understand. The top floor is where your eye stores things it needs to remember - kind of like a filing cabinet.

Now, think about each floor having a separate set of workers. The bottom floor workers are the "rods" and "cones" - special cells that react to light and send signals to the brain. The top floor workers are "ganglion cells" - they take information from the rods and cones and send it to your brain to be processed.

This is basically what a duplex retina is: it's an eye that has two sets of cells working independently from each other. This is different from most eyes, which have just one set of cells doing all the work.

Having a duplex retina is helpful because it allows your eye to process information more efficiently. Instead of all the cells working together in one big group, they can each specialize in their own jobs and pass information back and forth. So, even though it might seem a little complicated, having a duplex retina is actually a good thing!