What perception theory can we use?

For psych class, we came up with an experiment to test sight perception. We'll be putting different font sizes of a letter on separate pages, one per page, and testing if people will be able to see the differences in size at a distance. Basically, it's vision perception in relation to distance and size. The problem is that we need to come up with a Perception Theory(Gestalt continuity,bottom-up,top down,cognitive,empirical,etc..) I've tried all those examples, but they don't work well with our experiment. Someone help? What perception theory can we use?
 
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