Dynamic Visual Acuity

Ask the patient to read the lowest (smallest) line possible on a Snellen eye chart with best corrected vision (glasses, contact lenses). Repeat the maneuver while passively shaking the patient's head at 2 Hz, and record the number of lines of acuity "lost" during the headshake.

(+) Test: Loss of 3 or more lines: Vestibular dysfunction
Use a ETDRS eye chart – you can download at www.i-see.org/eyecharts.html, not www.isee.org (International Society of Explosive Engineers)

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