Measurement of visual acuity with two different charts; a comparison of results and repeatability in patients with cataract

To compare two different optotypes to measure visual acuity. Experiment 1: Fifty patients with moderate cataracts were asked to read a chart consisting of letters of the alphabet (Sloan letters) first and a chart comprising Landolt's broken rings afterwards. Experiment 2: Half of patients were...

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Bibliographic Details
Published inDocumenta ophthalmologica Vol. 90; no. 1; p. 61
Main Authors van den Brom, H J, Kooijman, A C, Blanksma, L J, van Rij, G
Format Journal Article
LanguageEnglish
Published Netherlands 1995
Subjects
Cataract - physiopathology
Humans
Reproducibility of Results
Vision Tests - methods
Visual Acuity - physiology
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Summary:To compare two different optotypes to measure visual acuity. Experiment 1: Fifty patients with moderate cataracts were asked to read a chart consisting of letters of the alphabet (Sloan letters) first and a chart comprising Landolt's broken rings afterwards. Experiment 2: Half of patients were instructed to repeat the reading with a second letter chart, the other half was instructed to read the chart with the broken rings again. Experiment 1: It was found that with the letter chart more optotypes (two to four) were recognized than with the broken ring chart. The different result of visual acuity measurement with the two optotypes is irrespective of the visual acuity. Experiment 2: The re-read instruction revealed that the measurements were reproduced equally for both charts.
ISSN:0012-4486
DOI:10.1007/BF01203295