What controls smooth pursuit eye movement?

The cerebellum, especially the vestibulo-cerebellum, is also involved in the online correction of velocity during pursuit. The cerebellum then projects to optic motoneurons, which control the eye muscles and cause the eye to move.

Is there a link between smooth eye pursuit and schizophrenia?

A wealth of evidence, including a recent preliminary report citing linkage of pursuit abnormality to chromosome 6p21 in relatives of schizophrenic patients, suggests that the smooth pursuit deficit marks the genetic liability to schizophrenia (Arolt et al., 1996; Clementz & Sweeney, 1990; Levy, Holzman, Matthysse, & …

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.

Can mental illness cause vision problems?

A link between vision problems and schizophrenia is well known, with as many as 62 percent of adult patients with the disorder experiencing some kind of visual distortions involving form, motion, or color.

Can anxiety cause shaky vision?

Common physical symptoms of anxiety include changes in your heart rate, breathing, and even vision. This includes, in some cases, developing blurred vision.

What doctor treats oscillopsia?

Oscillopsia is a symptom and not an underlying medical condition. As a result, a specific diagnosis does not exist for it. However, an ophthalmologist will diagnose the cause of oscillopsia.

How do you test pursuit smooth?

“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.”

How do you test for Optokinetic nystagmus?

Optokinetic nystagmus can be induced with an optokinetic drum, a banded cloth, a tablet application, or simply with the examiner moving the outstretched fingers in front of the patient. Looking at these moving visual patterns normally induces nystagmus with the slow phase in the direction of the pattern movement.

Can you see mental illness in the eyes?

Eye changes in people with schizophrenia may be related to several factors. Widening of small veins in the retinas, known as the retinal venules, may cause symptoms of psychosis in childhood and adulthood. Experiencing visual distortions may also indicate that a person has a mental health condition.

Can you see schizophrenia in eyes?

When there is a problem in the brain, it can often be seen in the eyes. Individuals with schizophrenia show differences in the way their eyes move and search for objects. This includes difficulties with the following typical eye movements : Smooth pursuit: the way the eye moves while following a moving object.

What is smooth pursuit tracking?

Smooth pursuit tracking is an ocular test used to determine whether there is central pathology that is precluding accurate tracking of moving targets by the eyes. Smooth pursuit tracking is susceptible to an age effect and may need the examiner to acclimate the patient to the task before recording.

What does a smooth pursuit test look like?

Figure 1: Smooth pursuit test showing a normal response to an increasing-frequency (Hz) target over time. The stimulus is the yellow target line and the right and left eyes are the red and blue tracings. The responses for each cycle of the pursuit are represented on the graph by red dots for the right eye and blue dots for the left eye.

Is smooth pursuit susceptible to age effect?

Smooth pursuit tracking is susceptible to an age effect and may need the examiner to acclimate the patient to the task before recording. This is intended only as a guide; official diagnosis should be deferred to the patient’s physician.