10-Prism-Diopter Fixation Test for Amblyopia

Purpose: To evaluate the clinical usefulness of the 10-prism-diopter (PD) fixation test in the diagnosis of amblyopia. Methods: The study comprised 132 children (42 normal, 90 amblyopes) who underwent the 10-PD fixation test and stereoacuity test. The sensitivity, specificity, false-positive and false-negative rates of the 10-PD fixation test were analyzed according to the clinical diagnosis. Results: The 10-PD fixation test sensitivity was 86%, the specificity was 61%, the false-positive rate was 17% and the false-negative rate was 24%. Data showed agreement between the 10-PD fixation test and the stereoacuity test (=0.737, p=0.000). The results in the 10-PD base-down test and base-out test also showed agreement (=0.779, p=0.000). Conclusions: The 10-PD fixation test is a simple and useful method in detecting amblyopia.

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