Ocular motility is tested when patients complain of double vision or if the neurologic disease is suspected. A visual assessment of the eyes tests for deviations that resulting from strabismus, extraocular muscle dysfunction, or palsy of the cranial nerves innervating the extraocular muscles.Saccadic dysfunction results in poor ability of the eyes to ‘jump’ from place to place. This will inhibit reading and other skills. This is tested by making the patient move his/ her eye quickly to targets at the far right, left, top and bottom.
The ‘follow my finger’ test makes the patient follow the examiner’s finger as it traces an imaginary ‘double H’ which touches upon the eight fields of gaze. Inferior, superior, lateral and medial rectus muscles and the superior and inferior oblique muscles are tested.