OS GSO ISO/TR 11797:2025
ISO/TR 11797:2024
Omani Standard
Current Edition
·
Approved on
14 October 2025
Ophthalmic optics – Spectacle lenses – Power and prism measurements
OS GSO ISO/TR 11797:2025 Files
English
50 Pages
Current Edition
Reference Language
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OS GSO ISO/TR 11797:2025 Scope
This document describes the methods currently used in applying tolerances to the focal powers of spectacle lenses and methods that can be considered for adoption in the future; it also describes methods of measuring the prism imbalance (relative prism error) between the lenses of a mounted pair. The results of a 2014 survey of manufacturing capability for lens power and a 2018 international web survey are discussed, as are possible new methods for applying tolerances to the focal power of spectacle lenses.
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