Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-134498 in English and French

in English and French

PD IEC/TS 62257-9-2:2016 supersedes DD IEC/TS 62257-9-2:2006 which is withdrawn

BS EN 60695-1-30 is a part of an international standard that covers safety guidelines for fire hazard testing

swimming pool engineers

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

Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-134498 in English and French1 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.