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Columbus believed he had reached Asia when he had traveled less than halfway there because geographical knowledge at the time was limited. They believed if they sailed West they would reach Asia by sea but actually ended up in the Americas. He thought the world was smaller than it actually was.
They were similar because with olfactory lethargy you have a delay in detecting a new smell because your receptors are overworked from a previously heavy smell, the same thing appear with afterimage, you stare at a color and your cones become lethargy, thus showing an afterimage of another color. they were contrasting because one deals with olfactory bulbs and the other deals with occipital lobes and optic nerves.