A test performed by placing an occluder over one eye and then moving it slowly over to the other eye to detect a tendency for the eyes to deviate while under the occluder (such an ocular misalignment is known as a phoria). Also called cross-cover test.

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1. A test performed by placing an occluder over one eye and then moving it slowly over to the other eye to detect a tendency for the eyes to deviate while under the occluder (such an ocular misalignment is known as a phoria). Also called cross-cover test.