BS PD ISO/TR 18476:2017 outlines all the steps from refraction to dispensing of spectacles, with particular attention to the benefits added by using free form technology, and provides a collection of relevant terms and descriptions.This document does not contain the proprietary features of lens designs provided by suppliers.Cross References:ISO 21987:2009ISO/TR 28980:2007 Ed 1ISO 8980-2:2004ISO 13666:2012 ED2ISO 8980-1:2004ISO 8598-1:2014 ED1ANSI Z80.1-2010All current amendments available at time of purchase are included with the purchase of this document.