{"tema_id":"168","string":"back vertex power           #01131","created":"2022-12-19 09:13:28","code":null,"notes":[{"@type":"Cataloger's note","@lang":"en-EN","@value":"reference: R093:1999 3.7.1 "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"ID: 01131 "},{"@type":"Definition note","@lang":"en-EN","@value":"reciprocal of the paraxial value of the back vertex focal length measured in metres "}]}