Visual acuity testing. From the laboratory to the clinic |
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Affiliation: | 1. School of Optometry, University of California, Berkeley, CA 94720, United States;2. School of Optometry and Vision Science, Queensland University of Technology, Kelvin Grove, QLD 4059, Australia |
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Abstract: | The need for precision in visual acuity assessment for low vision research led to the design of the Bailey–Lovie letter chart. This paper describes the decisions behind the design principles used and how the logarithmic progression of sizes led to the development of the logMAR designation of visual acuity and the improved sensitivity gained from letter-by-letter scoring. While the principles have since been adopted by most major clinical research studies and for use in most low vision clinics, use of charts of this design and application of letter-by-letter scoring are also important for the accurate assessment of visual acuity in any clinical setting. We discuss the test protocols that should be applied to visual acuity testing and the use of other tests for assessing profound low vision when the limits of visual acuity measurement by letter charts are reached. |
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Keywords: | Visual acuity Low vision Clinical research |
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