Journal Article10.1097/00006324-197611000-00006
New design principles for visual acuity letter charts.
Ian Bailey,Jan E. Lovie +1 more
1.4K
TL;DR: In this paper, the authors introduced new principles for the design and use of letter charts for the measurement of visual acuity, and advocated that the test task should be essentially the same at each size level on the chart.
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Abstract: This paper introduces new principles for the design and use of letter charts for the measurement of visual acuity. It is advocated that the test task should be essentially the same at each size level on the chart. Such standardization of the test task requires the use of letters of equal leg
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