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Disaggregation of Revenues, Geographic Sales and Product Sales (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Product Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 5,352	$ 5,363	$ 17,900	$ 16,061
Total net sales	31,770	23,473	92,768	65,759
ICLs [Member]
Product Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	26,418	18,110	74,868	49,698
IOLs [Member]
Product Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,824	3,892	12,068	12,875
Other surgical products [Member]
Product Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 1,528	$ 1,471	$ 5,832	$ 3,186

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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