Covert-saccades, Dynamic Visual Acuity and Quality of Life

Head Impulse Tests are performed by the clinician who holds the patient's head in his hands, while he is looking straight at an earth-fixed target; then by turning the patient's head abruptly and unpredictably to the left or right, up or down through a small angle (only 10-20 degrees - not a large angle). 20 impulses in each directions (6) will be performed.

Dynamic visual acuity Test (DVAT) assesses visual acuity during head movement relative to baseline static visual acuity. DVA will be assessed actively during self-generated rotations of the head in different directions.

VEMPs \& VEMPo are sound evoked muscular contractions of the neck or eye. They are recorded using an evoked response computer, a sound generator, and surface electrodes to pick up neck or eye muscle activation.

Dizziness Handicap Inventory is a questionnaire that identify difficulties that patient may be experiencing because of dizziness, yielding to a score ranging from 0 to 100

Oscillopsia severity questionnaire is a 9 items questionnaires that identify oscillopsia in different circumstances.