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ONORM EN ISO 8597:1996
Optics and optical instruments - Visual acuity testing - Method of correlating optotypes (ISO 8597:1994, including Technical Corrigendum 1:1995) (Austrian Standard)
Lays down a method of correlation between a given set of optotypes and the standard optotype (Landolt ring) specified by ISO 8596.
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Austrian Standards Institute [on]