superimposition

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superimposition 

The ability to see two similar images superimposed but not mentally fused. Examples: seeing a bird in a cage with both eyes in a synoptophore when one eye is presented with a bird and the other with a cage; seeing the letter E in a synoptophore when one eye is presented with the letter F and the other with the letter L. See Worth's classification of binocular vision.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Once students master the color key, they can learn how to distribute the color key to multiple focus areas on the stage.
The color keys were inadvertently reversed on the following graphs.
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The image recurs in each painting, often more than once, repeated in various ways--reversed, cropped, transposed into different color keys, and so on.