They want to compress the information -- they just want to send the changes, what's new in the image, and so on -- and that is how your eyeball is able to squeeze all that information down to your optic nerve, to send to the rest of the brain.
Žele sažeti informacije -- žele poslati samo promjene, što je novo na slici, i tako dalje -- a ovo je kako vaše oko uspjeva sažeti sve te informacije kroz vidni živac i poslati ih ostatku mozga.