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Geographic and Product Data (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Product Information [Line Items]
Net sales	$ 21,936	$ 20,974	$ 42,286	$ 40,243
ICLs [Member]
Product Information [Line Items]
Net sales	16,317	15,408	31,588	28,588
IOLs [Member]
Product Information [Line Items]
Net sales	4,377	5,068	8,983	10,134
Other surgical products [Member]
Product Information [Line Items]
Net sales	$ 1,242	$ 498	$ 1,715	$ 1,521

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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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