ISO 8596:2017
Ophthalmic optics — Visual acuity testing — Standard and clinical optotypes and their presentation
ISO 8596:2017 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.
ISO 8596:2017 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.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Specifications of the standard optotype
4.2 Visual acuity grades and standard optotype grades
4.3 Test area and spacing between standard optotypes
4.4 Positions of the optotype
4.5 Quality of presentation
4.6 Luminance
5 Test methods
5.1 Viewing distance for distance visual acuity testing
5.2 Criteria for determination and assignment of visual acuity grade
6 Test report
Annex A (informative) Optotypes for clinical investigations
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Specifications of the standard optotype
4.2 Visual acuity grades and standard optotype grades
4.3 Test area and spacing between standard optotypes
4.4 Positions of the optotype
4.5 Quality of presentation
4.6 Luminance
5 Test methods
5.1 Viewing distance for distance visual acuity testing
5.2 Criteria for determination and assignment of visual acuity grade
6 Test report
Annex A (informative) Optotypes for clinical investigations
Bibliography