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During class I wondered by human vision would evolve to process by edges. Initially, this seemed liked a pretty arbitrary method with the possibility of error or the brain misleading you. The idea of the brain filling in gaps does make me a little nervous. People usually think of what we see as fact, when a lot of it is made up by the brain. 

But for why we evolved to see by edges, I think this method is the simplest. If we had to process everything we saw, I feel like it would be too much information. In class we mentioned that edges are important to understanding biology. In terms are learning, we look at the edges to see how things are different. For example, if we were studying biomes are wanted to know were different biomes were, we would only look at the edges. The same method hold true for vision; we only need the edges.