Sunday, November 10, 2013

Monocular Cues: Part 1 -- Relative Size

Monocular Cues:  Unlike Binocular cues that work in three dimensions and work with both eyes, Monocular cues are in two dimensions and are a set of depth-cues that are available to us with just one eye. These cues provide us with solid depth-perception information.
The first example of Monocular Cues is Relative Size. Over time, our brains have learned that objects change size very slowly if at all. In other words, people don’t shrink to half their size, or double their size in an eye blink. It is because of this that we know that a person who is shrinking isn’t actually growing smaller but is moving farther away. When the image of an object gets larger on the retina, we interpret that it is getting closer. Conversely, when the image on the retina gets smaller, we interpret that as the object becoming farther away. A good example of Relative Size is knowing that from the top of a building people below are actually normal sized and far away rather than simply very small.

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