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Romberg's sign: A sign that is characterized by a reduced ability to balance with vision occluded; may be indicative of proprioceptive fixing.

Saccades: Rapid eye movements that move the line of sight between successive points.

Scotomas: Damaged areas of the macula that result in distorted, hazy, or blank areas in the visual field.

Seizures: An epileptic attack or the sudden onset of a disease process or specific symptoms.

Space perception: The ability to perceive the relative distances of objects and the absolute distance from an object to the observer.

Spasticity: A state of increased muscular tone characterized by exaggeration of the tendon reflexes and muscle resistance to passive movements.

Stereognosis: The appreciation of the form of an object by means of touch.

Tinnitus: A sensation of ringing or whistling in the ears.

Torticollis: A contraction of the muscles of the neck that typically involve muscles supplied by the spinal accessory nerve and characterized by a deformity that results in cervical rotation opposite the direction of cervical side bending.

Tracking: The ability to find and fixate on an object and follow its movement.