Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-105964 staple-fibre yarns

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due to national regulations

These guidelines and rules are part of the FDT specification (IEC TR 62453‑42) and are intended to ensure that all users are provided with clear and consistent user interface functions and features across DTMs in a system

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EN 438‑4 [2]

Ophthalmic optics. Visual acuity testing. Standard and clinical optotypes and their presentation Ingestion-build-105964 staple-fibre yarns1 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.