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

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Note: Each abbreviation introduced here is explained in the text the first time it appears

except where guidance is given as to dealing with spillages

ISO 8659 aids in establishing certain basic requirements for the endurance testing of plastics valves to ensure that uniform test methods are adopted

Evaluation of the business case has been expanded along with a new clause on defined engagement strategy

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.