Optics and optical instruments. Test lenses for calibration of focimeters - Test lenses for focimeters used for measuring spectacle lenses Ingestion-build-260237 With obedience and compliance to

With obedience and compliance to BS 1823

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This British Standard specifies a system of tolerance grades and required machining allowance grades for the dimensions of castings

Optics and optical instruments. Test lenses for calibration of focimeters - Test lenses for focimeters used for measuring spectacle lenses Ingestion-build-260237 With obedience and compliance to1 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