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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Product Information [Line Items]
Sales Revenue, Goods, Net	$ 5,935	$ 5,079
Net sales	27,093	20,350
ICLs [Member]
Product Information [Line Items]
Sales Revenue, Goods, Net	21,158	15,271
IOLs [Member]
Product Information [Line Items]
Sales Revenue, Goods, Net	4,058	4,606
Other surgical products [Member]
Product Information [Line Items]
Sales Revenue, Goods, Net	$ 1,877	$ 473

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and 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(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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