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An apparatus for producing and studying anorthoscopic perception which is the veridical perception of an image viewed under very uncommon conditions. It consists of a pair of circular discs mounted one behind the other. A figure is drawn on the rear disc and viewed through a slit in the front disc rotating at a different speed. The shape of the image will be clearly perceived.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann