Extraocular Movements (CN III, IV, VI)

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Check extraocular movements (eye movements) by having the patient look in all directions without moving their head. While doing this, ask them if they experience any double vision. Test smooth pursuit by having the patient follow an object moved across their full range of horizontal and vertical eye movements.

Test convergence movements by having the patient fixate on an object as it is moved slowly toward a point right between the patient's eyes.

Also, observe the eyes at rest to see if there are any abnormalities such as spontaneous nystagmus (which we discuss shortly) or dysconjugate gaze (eyes not both fixated on the same point), resulting in diplopia (double vision).

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