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Status : Active
Standard Type : Main
Document No : ISO/TR 11797:2024
Document Year : 2024
Pages : 50
Edition : 1
Section Volume : Ophthalmic optics and instruments (ISO/TC 172/SC 7.)
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.