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The purpose of this study was to determine inter- and intra-examiner repeatability of measurements of interpupillary distance (IPD). Three methods were used: Viktorin’s, corneal reflection, and pupillometer. In Experiment 1, an experienced optometrist measured IPD on forty-nine subjects, on two occasions, using each method. In Experiment 2, thirty-five optometrists measured the IPD of one subject, on one occasion only, using the same three methods. The results of Experiment 1 showed that measurements of IPD differed depending on the method used, although the differences were small. The 95% limits of agreement were largest with Viktorin’s method and least with the pupillometer. The results of Experiment 2 also revealed a small difference in IPD between the three methods of measurement. As in Experiment 1, the 95% limits of agreement were greatest with Viktorin’s method and least with the pupillometer …