EN ISO 18490:2015

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Chart print quality
5 Health and safety
6 Personnel administering the test
7 Test charts
8 Test procedure
9 Acceptance level
Annex A (normative) - Format and size of the optotypes
Annex B (normative) - Spacing of the optotypes
Annex C (informative) - Example test chart (Not to scale)

ISO 18490:2015 specifies the form of the optotype, the quality requirements for the chart, the test procedure, and the acceptance level for near vision acuity of NDT personnel. It also addresses the qualification requirements for personnel permitted to carry out the test.ISO 18490:2015 only addresses near vision acuity under defined conditions similar to those encountered during routine NDT inspection. It does not address an individual's overall visual acuity and users are advised to consider the need for a general eye examination by specialist medical personnel to ensure general vision acuity is appropriate for job function.ISO 18490:2015 does not address colour vision requirements.