title: The evolution of the broken ring visual acuity test figure.
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.
mesh_terms: D006801:Humans; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity