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Geographic and Product Data (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Product Information [Line Items]
Net sales	$ 20,974	$ 18,657	$ 40,243	$ 37,514
ICLs [Member]
Product Information [Line Items]
Net sales	15,408	12,236	28,588	24,490
IOLs [Member]
Product Information [Line Items]
Net sales	5,068	5,204	10,134	10,562
Core products [Member]
Product Information [Line Items]
Net sales	20,476	17,440	38,722	35,052
Other surgical products [Member]
Product Information [Line Items]
Net sales	$ 498	$ 1,217	$ 1,521	$ 2,462

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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

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