Fixation disparity and fixation disparity curves (FDC's) are useful in assessing, diagnosing, managing, and monitoring patients with binocular vision disorders. When making an FDC, fixation disparity measurements are taken through different amounts of base-in (BI) and base-out (BO) prism. In previous studies little attention has been paid to the order of prism presentation. Differences in FDC's may result due to prism adaptation if the order of prism presentation is altered. This study compared two orders of prism presentation, and found that the two methods differed significantly at the BI extremities of the FDC. These results indicate that prism presentation method should be specified in further studies of FDC's, and noted when measuring or comparing the FDC's of patients.
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