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Geographic and Product Data (Details 1) - USD ($) $ in Thousands	12 Months Ended
	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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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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