Dr M.Nirumal Khumar(Neuro nerd) on Instagram: "Head impulse test is the most important test in acute vertigo! Our eyes are like a camera(but one with much higher resolution)..so the eyes are supposed to stay focused even when the head is moving .The vestibulo ocular reflex pushes the eyes to the opposite side when the head is turned towards that side(left vestibular system pushes the head towards right and vice versa).. The above pt showed inadequate eye movement to the right on left head turn.