https://digilab.ptb.de/oiml-g-18/vocab/ OIML G18 Controlled Vocabulary Julia Neumann Julia Neumann 2022-12-16 en-EN 2022-12-19 09:13:41 2022-12-19 13:55:38 vertex power #01130 2022-12-19 09:13:41 2022-12-19 13:55:38 (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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