Fig. 3From: A smartphone ocular alignment measurement app in school screening for strabismusROC curve, i.e. sensitivity vs. false positive rate, as it varies by prism diopter threshold (solid blue staircase shaped line). The optimum threshold used to indicate a positive screen (closest point to the top left corner) was determined to be 3.0△. Sensitivity and Specificity with this threshold were 83.0 and 76.5% (1–0.235) respectively, marked by the gray dashed lineBack to article page