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For many years I have used a Maddox rod with a double loop of piano wire arranged as shown in figure 1 to hang over one lens of a pair of glasses to determine quickly whether a decentered lens or a crooked or bent frame is producing a vertical prism. I have been using a Maddox rod made of red glass and a round electric globe which I employ as my source of light in doing retinoscopy. The patient quickly and easily sees the red horizontal stripe and can tell whether it goes through the center of the light or not. The test is performed so quickly that it has become a routine procedure in checking lenses when the patient returns with his glasses. The
Bothman L. QUICK TEST FOR PRESENCE OF A VERTICAL PRISM PRODUCED BY A DECENTERED LENS OR A CROOKED FRAME. Arch Ophthalmol. 1937;17(6):1087–1088. doi:10.1001/archopht.1937.00850060143014
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