Visual acuity test types Test charts for clinical determination of distance visual acuity. Specification

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

13-01-2003

Publisher

British Standards Institution

Committees responsible
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Environmental conditions
6 Electrical safety
7 Labelling
Annex A (informative) Conversion of different visual
acuity notations
Annex B (normative) Letter formats
Bibliography
Figure and Tables

Gives minimum requirements for test charts and test types employing upright sans-serif capital letters for use in the clinical determination of distance visual acuity.

This Part of BS4274 specifies minimum requirements for test charts and test types employing upright sans-serif capital letters for use in the clinical determination of distance visual acuity.

NOTE Unless otherwise indicated by the context, the word \'letter\' includes, in any orientation, the single letter C (Landolt or broken ring) and the single letter E (illiterate E).

This Part of BS4274 is primarily intended for clinical measurements but may be used for other purposes such as screening, certification and licensing. It is not applicable to chart projectors, charts or types designed for specialized use (e.g. crowding symbols, lower case letters, isolated letters, low vision evaluation and contrast sensitivity testing).

NOTE This British Standard makes no reference to surrounding luminance because this relates to the conditions in the consulting room or clinic itself and this is outside the Scope of this British Standard. Nevertheless, the level of surrounding luminance can seriously affect the visual acuity scores obtained, for example, by producing glare or excessive contrast. Attention, therefore, should be paid to the level of surrounding luminance when installing and utilizing these test charts.

Committee	CH/172/6
DevelopmentNote	Supersedes BS 4274-1(1968) and 00/560371 DC. (01/2003) Reviewed and confirmed by BSI, December 2011. (11/2011)
DocumentType	Standard
Pages	14
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 4274-1:1968

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BS 4274-1:2003

Visual acuity test types Test charts for clinical determination of distance visual acuity. Specification

Table of Contents

Abstract

Scope

General Product Information

Standards Referencing This Book

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