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.