An optokinetic drum—also called a Catford drum—is a rotating instrument to test vision in which individuals are seated facing the wall of the drum. The interior surface of the drum is normally striped; thus, as the drum rotates, the subject's eyes are subject to a moving visual field while the subject remains stationary, this phenomenon is called optokinetic nystagmus.
An optokinetic drum—also called a Catford drum—is a rotating instrument to test vision in which individuals are seated facing the wall of the drum. The interior surface of the drum is normally striped; thus, as the drum rotates, the subject's eyes are subject to a moving visual field while the subject remains stationary, this phenomenon is called optokinetic nystagmus.
Source: Wikipedia "Optokinetic drum" · CC BY-SA 4.0
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