Optics and optical instruments. Test lenses for calibration of focimeters - Test lenses for focimeters used for measuring spectacle lenses Ingestion-build-266356 Extensions to the time distribution

Extensions to the time distribution and clock

BS EN 14688 helps you in manufacturing better quality washbasins

This International Standard specifies a method for the determination of carbon monoxide (CO) in the vapour phase of cigarette smoke

This International Standard is applicable to film with or without a gelatin backing

The use of cork underlays should follow the instructions of the manufacturer

Optics and optical instruments. Test lenses for calibration of focimeters - Test lenses for focimeters used for measuring spectacle lenses Ingestion-build-266356 Extensions to the time distribution1 Scope This part of ISO 9342 specifies requirements for test lenses for the calibration of focimeters that are used for the measurement of spectacle form lenses. NOTE It is accepted that other test lenses can also be used with powers within the given range, manufactured to the same standard of accuracy and form, but different back vertex powers. However, only lenses with integer nominal powers, as described in Annex A, can be used for the calibration