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It would be useful to define what it is we are trying to determine:
Tests of motor function can be divided into 'binocular' tests which maintain fusion (for example, fixation disparity) and those which dissociate the eyes (such as cover test and the Maddox rod). As a general principle, binocular tests should always precede dissociation tests. In practice, this is often reversed and frequently patients are tested for fixation disparity having been thoroughly dissociated before, and in some cases, during the test. The odd false positive might be expected in these cases.
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