Ophthalmic instruments. Perimeters included-in-kit What is BS 6997 –

What is BS 6997 – NBR O-ring specification about

For supplemental guidance

5 List of hazards

deflected through their working range to the minimum width under the conditions laid down in the test

see Annex A

Ophthalmic instruments. Perimeters included-in-kit What is BS 6997 –1 Scope This International Standard specifies requirements and test methods for instruments designed to assess differential light sensitivity in the visual field by the subjective detection of the presence of test stimuli on a defined background. It does not apply to clinical methodologies and other psychophysical tests of the visual field. This International Standard takes precedence over ISO 15004, if differences exist.