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BS EN ISO 8596:1996 - Visual acuity test types. Specification for Landolt ring optotype for non-clinical purposes (British Standard)
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Eye Shield And Indicating Stick On The Eyesight Test Chart (Landolt Ring) Stock Photo, Picture And Royalty Free Image. Image 75731776.
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Intermediate Visual Acuity Chart with Landolt Cs, 80cm | Intermediate Vision Tests | Visual Acuity | VISUS webshop
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