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Disaggregation of Revenues, Geographic Sales and Product Sales (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Dec. 29, 2017
Geographic and Product Data [Line Items]
Number of Countries in which Entity Operates	75		75
Sales Exceed Percentage			10.00%
Sales Revenue, Net [Member] | Ophthalmic Surgical Product [Member]
Geographic and Product Data [Line Items]
Concentration Risk, Percentage			100.00%
Customer One [Member] | Accounts Receivable [Member]
Geographic and Product Data [Line Items]
Concentration Risk, Percentage			36.00%		24.00%
Customer One [Member] | Sales Revenue, Net [Member]
Geographic and Product Data [Line Items]
Concentration Risk, Percentage	42.00%	32.00%	38.00%	27.00%

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- Definition

Line items represents the geographic and product data.

+ References

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- Definition

It represent sales exceed percentage.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

The number of countries in which the entity operates as of balance sheet date.

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