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  • Title: The evolution of the broken ring visual acuity test figure.
    Author: Pointer JS, Gilmartin G, Larke JR.
    Journal: J Am Optom Assoc; 1980 Aug; 51(8):741-5. PubMed ID: 7440874.
    Abstract:
    The evolution of the broken ring visual acuity figure is described, with particular reference to the contributions of Snellen and Landolt. Reference is also made to its recent application in a study of visual performance, where an angular version of the figure is generated on a television screen.
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