Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 1 — Information about emission-related

1 — Information about emission-related confirmed DTC(s)

BS EN 50121‑3‑1:2017+A1:2019 supersedes EN 50121-3-1:2015

Manufacturers of belt drives and pulleys

Recommendation for the maximum length of a dental explorer was reduced from 178 mm to 173 mm in 4

BS ISO 4254-9 does not apply to:

Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 1 — Information about emission-related1 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.