LOL.

Schultze in 1866 developed duplex retina theory. Duplex retina theory describes that using microscope, Schultze saw two different types of structures in the retina.
How fabulous is this theory. Now every College kids whos taking perception will see his glorous name.
Well after thirty years of advancement, what have we found?
Von Kries at 1896 developed duplicity theory, proposing that rods and cones differed not only in structure (really?), but also in function.

YES! A DIFFERENT FUNCTION.
Oh gosh I love this class.