The<unk> , also known as<unk> s<unk> -step<unk>  or<unk>  head tilt<unk> , is a method used to isolate the paretic extraocular muscle, particularly superior oblique muscle and trochlear nerve (IVth cranial nerve), in acquired vertical double vision. It was originally described by Marshall M.<unk> .
Parks–Bielschowsky three-step test
Hawkins–Kennedy test
Tinetti test
Kastle–Meyer test
Schober's test
Goldberg test
Modified Ashworth scale
Hirschberg test