IS 18583 : Part 1 : 2024/ISO 9342-1 : 2023 Optics and Optical Instruments - Test Lenses for Calibration of Focimeters - Part 1 Reference Lenses for Focimeters Used for Measuring Spectacle Lenses

NATIONAL FOREWORD

This Indian Standard (Part 1) which is identical to ISO 9342 -1 : 2023 'Optics and optical instruments - Test lenses for calibration of focimeters - Part 1: Reference lenses for focimeters used for measuring spectacle lenses' issued by the International Organization for Standardization (ISO) was adopted by Bureau of Indian Standards on the recommendation of the Ophthalmic Instruments and Appliances Sectional Committee and after approval of the Medical Equipment and Hospital Planning Division Council.

The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.