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Graham Strong, OD, MSc; George C. Woo, OD, PhD

Arch Ophthalmol. 1985;103(1):44-46.

Abstract
• Standardized visual acuity assessments are possible when consideration is given to legibility, acuity row legibility, letter spacing, optotype, row arrangement, and letter size gradation. The relative optotype legibilities reported by Sloan were verified experimentally under simulated conditions of optical defocus. Acuity row component letters were selected to equalize aggregate row legibilities and were arranged to minimize contaminative sequencing dependency. We describe a new acuity chart format with vertical acuity row presentations to eliminate bias from previous reading experience, and testing procedures using this chart.

Author Affiliations
From the School of Optometry, University of Waterloo (Ontario).

Footnotes
Accepted for publication Aug 30, 1984.

Reprint requests to School of Optometry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1 (Dr Strong).

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