Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 nor from a significant hazard

nor from a significant hazard to life

BS ISO 4254-9 does not apply to:

1 has been corrected

intended to be connected to public low-voltage distribution systems of between 220 V and 250 V line to neutral at 50 Hz

Some text has been deleted from clause 5

Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 nor from a significant hazard1 Scope This British Standard specifies requirements for red and green filters of glass or plastics materials used in ophthalmic tests as follows: a) dichromatic tests for ametropia, and b) dissociating the eyes in various tests of binocular co operation.