🎯 Pathology

• eye movement disorder due to a lesion in the medial longitudinal fasciculus (MLF)

• the MLF is an essential tract for the coordination of eye movements

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💡 Types

• multiple sclerosis

• brainstem infarction

• infections (e.g. syphilis, HIV, herpes zoster)

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🩺 Clinical features

• for example, if the patient is looking to the left and the right medial longitudinal fasciculus (MLF) is affected

• ipsilateral eye: impaired ADDuction (cannot look to the left)

• contralateral eye: abduction with nystagmus

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🕵️‍♂️ Investigations

• clinical diagnosis

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💆‍♂️ Management

• treat the underlying cause​​