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Geographic and Product Data (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2014 | Sep. 27, 2013 | Oct. 03, 2014 | Sep. 27, 2013
Product Information [Line Items] |  |  |  |
Net sales | $ 18,188 | $ 17,106 | $ 58,414 | $ 53,271
Implantable Collamer Lenses [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | 10,640 | 10,725 | 35,052 | 32,616
Intraocular Lenses [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | 5,763 | 5,322 | 18,804 | 17,533
Core products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | 16,403 | 16,047 | 53,856 | 50,149
Other surgical products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Net sales | $ 1,785 | $ 1,059 | $ 4,558 | $ 3,122

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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