Final answer:
True. CN palsy of 3,4,6 can all cause diplopia. CN 3 palsy affects eye movement. CN 4 palsy affects downward gaze. CN 6 palsy causes horizontal double vision.
Step-by-step explanation:
True. Cranial nerve (CN) palsies of the oculomotor nerve (CN 3), trochlear nerve (CN 4), and abducens nerve (CN 6) can all cause diplopia, which is the perception of seeing two images of a single object.
CN 3 palsy can result in double vision because it affects the movement of the eye and can cause misalignment.
CN 4 palsy can also cause double vision, especially when looking downward, because it controls the superior oblique muscle responsible for depressing and rotating the eye.
CN 6 palsy can lead to horizontal double vision, as it affects the lateral rectus muscle responsible for abducting the eye.