The investigators utilized the Stroop color naming paradigm as a tool to monitor visual performance under various optical conditions (plus and minus lenses and base in and base out prisms). Decreases in performance on the experimental task would indicate (hypothetically) an increase in nearpoint visual stress and/or decreased attention to the task. Subjects were screened for visual acuity, stereopsis, and fixation disparity while looking through habitual lens prescriptions, if any, and through +2.00 and -2.00 diopter lenses and 6 prism diopter base in and base out prisms. The 20 subjects passing criteria were then trained and subsequently tested on a computerized version of the Stroop color naming task while viewing through the various lenses and prisms as well as the habitual prescription. Data analysis attempted to relate changes in fixation disparity, convergence, or dioptric vergence to changes in performance on the visually directed Stroop task. No significant results were obtained and hence, within this paradigm, one cannot conclude that short-term induced changes in fixation disparity, convergence, or dioptric vergence are related to performance on a visual discrimination task.
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