PMC10415030_01
Right horizontal HIT: mild hypofunction with a reduced gain of 0.65 (normal value = >0.8) and both covert and overt saccades. Left horizontal HIT: disconjugate pattern. Mild to moderate gain reduction of 0.61 with a robust covert saccade bundle of the right abducting eye (red). Left adducting eye analysis (blue) shows a severe gain reduction of 0.09 yet no correction saccades.
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F1
The clinical head impulse test was inconclusive; therefore, binocular video head impulse testing [Synapsys VHIT Ulmer 2.0, Marseille ] was performed (Figure 1).