Reliability of the Snellen chart
- 10 June 1995
- Vol. 310 (6993) , 1481-1482
- https://doi.org/10.1136/bmj.310.6993.1481
Abstract
During the measurement of visual acuity only the angular subtense of the letters should change as the subject reads down the chart, which is not the case with the Snellen chart. Variation in the number of letters on each line presents the subject with a task of increasing difficulty rather than providing an equivalent task at all …Keywords
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