NBN EN ISO 8596 : 2009

Committees responsible
National foreword
Foreword
Specification
1 Scope
2 Normative references
3 Standard optotype
4 Visual acuity grades and standard optotype grades
5 Test area and spacing between standard optotypes
6 Presentation of the standard optotype
7 Luminance
8 Test report
Tables
1 Visual acuity grades
2 Spacing between standard optotypes (border to border)
3 Luminance
Figure
1 Landolt ring
Annex
ZA (normative) Normative references to international
    publications with their corresponding European
    publications

Gives a range of Landolt ring optotypes and describes a method of measuring distance visual acuity under daylight conditions for the purposes of certification or licensing. Not intended for use for clinical measurements nor for certifying blindness or partial sight.