What does positive smooth pursuit mean?

¶ Smooth pursuit (SP) means foveal tracking of a small moving target. SP cares about position of the target in a way that optokinesis does not. ¶ SP is a conjunctive eye movement, but only one eye has to be looking at target.

What is the smooth pursuit neck torsion test?

Objective: The smooth pursuit neck torsion test is thought to be a measure of neck afferent influence on eye movement control and is useful in assessing subjects with whiplash, especially those complaining of dizziness.

What does abnormal smooth pursuit mean?

Smooth pursuit eye movements (SPEM) have also been reported to be abnormal with reduced gain or speed of eye movement and saccadic pursuit (SP). SPEM gain is not easily evaluated clinically and measurement requires laboratory equipment. SP are saccadic eye movements seen during SPEM.

Why are smooth pursuits important?

Smooth pursuit eye movements allow us to keep a moving target in our fovea and clearly visualize it.

What is the difference between smooth pursuit and saccadic eye movements?

Saccades and smooth pursuit eye movements are two different modes of oculomotor control. Saccades are primarily directed toward stationary targets whereas smooth pursuit is elicited to track moving targets.

What do Saccades do?

Saccades are rapid eye movements designed to shift the fovea to objects of visual interest. Abnormalities of saccades offer important clues in the diagnosis of a number of movement disorders.

How do you test for smooth pursuits?

“You will see a green dot on the screen. The dot will move from one side of the screen to the other in a smooth, predictable motion. Your task is to follow the dot with your eyes while keeping your eyes precisely on the dot. Try not to move your head and try not to get ‘ahead of’ or ‘behind’ the target.”

What controls smooth pursuit?

Smooth pursuit movements are also mediated by neurons in the PPRF, but are under the influence of motor control centers other than the superior colliculus and frontal eye field. In humans, damage of comparable areas in the parietal and occipital lobes also results in abnormalities of smooth pursuit movements.

What are saccades and pursuits?

Saccades are rapid eye jumps, bringing our focus from one object to another. Pursuits are smooth eye movements that involve following or tracking a moving target. This is especially important for people such as athletes who need to keep their eyes on a moving ball.

Why is vestibular input needed for smooth pursuit?

Processing of vestibular signals requires interactions with visual, somatosensory and even motor command signals for precise reconstruction of head movement in space. They evolved in order to ensure clear vision while the animal pursued a small object (target) moving slowly and smoothly.

How do you do a smooth pursuit test?

Vestibular Testing: Smooth Pursuit. The smooth-pursuit test (also known as sinusoidal or oscillating tracking) is performed with the patient seated in front of a light bar. The patient is asked to “follow the lights” while holding their head perfectly still.

What is the smooth-pursuit test (sinusoidal tracking)?

The smooth-pursuit test (also known as sinusoidal or oscillating tracking) is performed with the patient seated in front of a light bar. The patient is asked to “follow the lights” while holding their head perfectly still.

What should be included in a vestibular assessment?

When conducting any vision screening or testing, it is important to watch and ask the patient how must effort a task requires and the degree of symptoms provoked. The basic oculomotor screen during a vestibular assessment should include: Spontaneous nystagmus is tested in primary and eccentric gaze.