Table 2.

Standardized clinical ocular motility examination.

Instruction given to subject	Target presented	Abnormal findings assessed by reviewers
Look at camera	Camera (3 s)	Square wave jerks
		Nystagmus
Look and keep looking right, left, up, down (3 s each)	None	Nystagmus
		Gaze limitation
		Gaze impersistence
Visually follow moving target	Target moving at	Saccadic intrusions into smooth pursuit
	30°/s horizontally
	15°/s horizontally
	30°/s vertically
	15°/s vertically
	(3 cycles of each)
If you see a target in the periphery, look at it	Stationary target at 25° from center on horizontal (random left and right), 25° from center on vertical (random left and right) (3 of each)	Lack of visually guided saccades
		Dysmetria
		Anticipatory movements (i.e. eye Movement generated when no target provided)
If you see a target in the periphery, look in the opposite direction	Stationary target at 25° from center on horizontal (random left and right) 25° from center on vertical (random up and down) (3 of each)	Anti-saccade error (i.e. eye movement toward target) or no movement when target provided
		Anticipatory movements (i.e. eye movement when no target provided)
Close your eyes, open your eyes	None	Eyelid opening apraxia
		Eyelid closure apraxia
Close your eyes while one eye is held open	None	Impaired Bell's phenomenon (i.e. limited ocular deviation during attempted eye closure)
Look at the camera while your head is moved	Camera	Limited vestibular ocular reflex