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The LEA numbers were designed by me in 1993 and calibrated by Juvi Mustonen OD and Risto Näsänen PhD in 1994. The letter charts that are commonly used in western countries are ...
... 6,8 and 9 are more difficult to recognise than it is to detect where the space is in the Landolt C. Calibration of the size of the number optotypes was done by Juvi Mustonen, O.D ...
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