Maddox Rod Test

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The Maddox rod test uses a specially constructed device consisting of a series of parallel cylinders that converts a point source of light into a line image. The optical properties of the cylinders cause the streak of light to be situated 90° to the orientation of the parallel cylinders. Because fusion is precluded by the Maddox rod, heterophorias and heterotropias cannot be differentiated. The Maddox rod can be used to test for horizontal and vertical deviations, and, when used in conjunction with another Maddox rod, for cyclodeviations.