Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-134498 BS EN 13636 specifies the

BS EN 13636 specifies the principles for the implementation of a system of cathodic protection against corrosive attacks on buried metal tanks and associated piping

which enables a guarantee of accuracy corresponding to the special features

PD IEC/TS 62257-9-2:2016 supersedes DD IEC/TS 62257-9-2:2006 which is withdrawn

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Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-134498 BS EN 13636 specifies the1 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.