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Geographic and Product Data (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Sep. 29, 2017 | Sep. 30, 2016
Product Information [Line Items] |  |  |  |
Net sales | $ 23,473 | $ 20,052 | $ 65,759 | $ 60,295
ICLs [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | 18,110 | 14,801 | 49,698 | 43,389
IOLs [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | 3,892 | 4,649 | 12,875 | 14,783
Other surgical products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | $ 1,471 | $ 602 | $ 3,186 | $ 2,123

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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