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Geographic and Product Data (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2016 | Jan. 01, 2016 | Jan. 02, 2015
Product Information [Line Items] |  |  |
Net sales | $ 82,432 | $ 77,123 | $ 74,987
ICLs [Member] |  |  |
Product Information [Line Items] |  |  |
Net sales | 59,111 | 51,543 | 44,047
IOLs [Member] |  |  |
Product Information [Line Items] |  |  |
Net sales | 19,706 | 19,857 | 24,336
Other surgical products [Member] |  |  |
Product Information [Line Items] |  |  |
Net sales | $ 3,615 | $ 5,723 | $ 6,604

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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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