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Light passes through one fluid, the lens of your eye, and then another fluid before reaching the retina. On the retina light interacts with photoreceptors and those send signals into neurons. The first step of neurons has a lot of cross interactions in order to make edges sharper and colors more vivid. There are at least six steps before the information reaches the back of your head where the first level of processing takes place. After it has recognized what sort of shape you are looking at different parts of the brain are involved, such as one for recognizing faces or another for reading, or some other part for recognizing a chair. After this the mental picture of what is around you will have been formed.
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