vertex power #01130https://digilab.ptb.de/oiml-g-18/vocab/skos/2038en-ENJulia Neumann2022-12-19 09:13:412022-12-19 13:55:38https://digilab.ptb.de/oiml-g-18/vocab/OIML G18 Controlled Vocabularytext/html (1) The unit for expressing vertex power is the reciprocal metre (m-1). The name for this unit is the “dioptre”, for which the symbol is D.
(2) Conventionally the back vertex power, in dioptres, is specified as the “power” of a spectacle lens, although the front vertex power is required for certain purposes (for example in the measurement of some multifocal lenses).

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