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Disaggregation of Sales, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 3,132	$ 4,466	$ 7,383	$ 10,313
Total net sales	62,367	35,194	113,119	70,381
ICLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax	59,235	30,728	105,736	60,068
IOLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax	3,074	2,561	6,799	6,555
Other surgical products [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 58	$ 1,905	$ 584	$ 3,758

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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