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Humans (and many mammals, for that matter) are not born knowing how to use our eyes. During the first month we can only discern vague shapes and shadows beyond much more than a foot or so, though some color development takes place during that time. (References here and here.)I won't go into anymore detail; the point being that the brain of a person who is ...


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Yes, is is possible to test for it, but with some very severe limitations for most classical tests, like Ishihara plates. If you go to the Wikipedia page for Ishihara test you may see a demonstration of effects that will or will not apply to your personal type of vision. This gets all the more striking if you show those pictures (preferably all the plates ...


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