Landolt circle

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A circle with a tiny part of its circumference missing, easily perceived as a circle in spite of the fact that it is not a closed curve, illustrating the closure grouping law and the phenomenon of Prägnanz. It is used mainly to test visual acuity, the respondent being shown a series of small differently oriented Landolt circles and asked to say where the gaps appear, choosing from alternatives such as twelve o'clock, three o'clock, six o'clock, and nine o'clock. Also called a Landolt C. [Named after the Swiss-born German physical chemist Hans Heinrich Landolt (1831–1910) who devised it]

Subjects: Psychology.

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