Oculomotor, trochlear and abducens

Question 1

What is diplopia?

Answer 1

Double vision

Question 2

What is jerk nystagmus?

Answer 2

involuntary, rhythmic moving of the eyes that can be vertical, horizontal or rotary.

Lasts for several beats to be significant.

Question 3

What is pendular nystagmus?

Answer 3

eye movements of similar size and speed in both directions

Question 4

Physiological nystagmus

Answer 4

normal phenomenon where the eyes move at extremes of lateral gaze or when looking out of a moving train

Question 5

How to test the function of these cranial nerves

Answer 5

Ask patient to follow finger from the midline and slowly draw a H shape in the air (within 30 degrees of the midline)

Look for nystagmus and diplopia

Question 6

Before testing the eye movements, you should ask…

Answer 6

“do you have any blurred or double vision at the moment?”