https://poisensei.com/bielschowsky-head-tilt-test/
Bielschowsky Head Tilt Test: Why the Eye Goes Up｜Poi Sensei
Head tilt makes the eyes counter-roll. In superior oblique palsy the superior rectus intorts alone and elevates, so the eye goes up. Plus where the test misses.
head tilt testthe eyebielschowskygoessensei