BUSINESS: Suppliers Top Labs Methodology By Staff Wednesday, September 26, 2012 12:01 AM RELATED CONTENT How the Big Wholesale Labs Measure Up in 2012 Top Labs Performance Analysis Top Labs Then (1992) and Now (2012) Vision Monday’s TOP LABS – 2012 (in alphabetical order) The Top 25 Independent Labs in 2012 at a Glance Top Labs in the News Top 5 Supplier-Owned Lab Networks Ranking Top 25 Independent Wholesale Labs Ranking Methodology To rank the Top Labs, Vision Monday chose only wholesale labs whose primary business is processing prescription lenses. Labs operated by optical retail chains, mass merchants, sunglass suppliers and closed-loop managed vision care providers were not included in the group. Rankings were determined primarily on the basis of 2012 estimated Rx sales volume, with the number of Rx jobs processed per day serving as a secondary criterion. Rx sales are determined by calculating the percentage of total net sales derived from surfaced and/or finished prescription lenses. Estimates of Rx jobs produced per day include safety lenses, but not contact lenses. For labs with one or more branches, Rx sales and Rx jobs are estimated on a company-wide basis. Branches are defined as lab locations that operate separately and in addition to the main headquarters lab. Companies with the same amount of Rx sales were ranked according to the number of Rx jobs per day; companies with the same amount of Rx jobs per day were ranked alphabetically.