Optokinetic Drum
![](https://images.upbeatnews.com/posts/10530/gOvaBbVtznfEUKriH6cCdaD2Fe8ojfcFFmHa1bdo.jpeg)
The optokinetic drum was used to see the reflex movements of the eyes and visual illusions. The man in the photo, Dr. G.H. Byford, is wearing contact lenses with a mini lamp cemented to them so they can accurately track the eye movements.
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