Superior oblique testing for 4th nerve is done by checking its intorsion while asking the subjet to look -
superior oblique is supplied by 4 cranial nerve- trochlear. Primary action of superior oblique is intorsion ( also called incycloduction- rotatory movement along anteroposterior axis in which superior pole of cornea (12 o clock point) moves medially.)secondary actions include depression and abduction.
Straight down
Straight up
Down and in
Down and out
Ocular motility and squint