Accuracy and Precision of VOG Skew Testing
We found a good correlation between VOG and the orthoptist examination, which is in line with previous studies.3 There was no significant difference of skew measurements across all conditions except 1 PD (0.57°) and 4 PD (2.28°). Small skews were significantly overestimated by the orthoptist. VOG showed a good accuracy and was not inferior to APCT. The VOG system offers a better precision (small standard deviation) for little skew deviations (1-2 PD (0.57 -1.14°)), however, the overall precision was moderate due to small eye tracking artifacts. This finding mandates a sufficient number of tests per subject.