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Disaggregation of Revenues, Geographic Sales and Product Sales - Net Sales by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 20,863	$ 22,872	$ 22,286
Total net sales	$ 38,883	$ 39,055	$ 39,664	$ 32,583	$ 31,186	$ 31,770	$ 33,905	$ 27,093	150,185	123,954	90,611
ICLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax									129,322	101,082	68,325
IOLs [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax									15,689	16,193	17,258
Other surgical products [Member]
Product Information [Line Items]
Revenue from contract with customer, excluding assessed tax									$ 5,174	$ 6,679	$ 5,028

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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