case_images: PMC10415030_01
case_images: 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.
case_images: fneur-14-1222475-g0001.jpg
case_images: PMC10415030_01_fneur-14-1222475-g0001.jpg
case_images: F1
case_images: The clinical head impulse test was inconclusive; therefore, binocular video head impulse testing [Synapsys VHIT Ulmer 2.0, Marseille ] was performed (Figure 1).