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To the Editor.—In answer to Dr. Pascal's letter, I think a few words more regarding torsional diplopia would have cleared up any question ; however, it was probably so clear to Dr. Duane that he did not see a chance for misunderstanding. To begin with, a tilting of the vertical meridian of the cornea to Dr. Duane always meant a tilting of the upper end of the meridian.
Considering the table of abbreviations on page 188 of this article, when the right image is below, it is a DR (right eye higher). When the left image is below, it is a DL (left eye higher). Therefore, reasoning along the same line with B, when the upper end of the image is tilted out, the eye is tilted in, and so is a DI. When the upper end of the image is tilted in, the eye is tilted out, the eye is tilted in,