An Evaluation of Test-Retest Reliability of the Saccadometry Test.

Purpose: Saccadometry is an advanced ocular motor test that allows functional assessment of the various brain regions and circuits involved in the generation of accurate saccadic eye movements. Recently, some manufacturers have included the saccadometry test in the videonystagmography (VNG) test battery. This study aimed to evaluate the test–retest reliability of the saccadometry test, which is part of the VNG test battery.Methods: Thirty-five healthy participants (mean age ± standard deviation = 24.66 ± 4.4 years; 26 female and 9 male participants) 18–30 years of age were included in this study. Each participant underwent the saccadometry test twice, 1 week apart, by the same experienced clinician. To determine test–retest reliability, paired t tests and Wilcoxon signed-rank test were conducted to compare the means of two measures, and intraclass correlation coefficients were used to reflect the degree of correlation between measures.Results: Statistically significant differences were not observed when the first test–retest measures of latency, velocity, accuracy, and directional error rate were compared (p > 0.05). For prosaccades, intraclass correlation coefficient values of test–retest reliability between the first test and retest means were 0.707 for latency, 0.488 for velocity, 0.594 for accuracy, and −0.248 for directional error. For antisaccades, these values were 0.813 for latency, 0.48 for accuracy, 0.808 for velocity, and 0.807 for directional error.Conclusion: Saccadometry provides acceptable levels of test–retest reliability for both antisaccades and prosaccades. Test–retest reliability varied from poor to good for latency, velocity, accuracy, and directional error.