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Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-105964 Indicating and recording instruments that1 Scope This document specifies a range of Landolt ring optotypes and describes a method for measuring distance visual acuity under photopic conditions for the purposes of certification or licensing. This document is neither intended as a standard for clinical measurements nor for the certification of blindness or partial sight. Other optotypes used for clinical investigations are described in Annex A for information.