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Geographic and Product Data (Tables) | 12 Months Ended
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Dec. 29, 2017
Segment Reporting [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] | The composition of the Company’s sales to unaffiliated customers is set forth below (in thousands):
Net sales to unaffiliated customers |  | 2017 |  | 2016 |  | 2015 |
Japan |  | $ | 17,424 |  | $ | 17,329 |  | $ | 16,982 |
China |  |  | 23,881 |  |  | 16,019 |  |  | 12,571 |
United States |  |  | 7,894 |  |  | 9,859 |  |  | 10,904 |
Korea |  |  | 5,543 |  |  | 7,455 |  |  | 8,061 |
Others* |  |  | 35,869 |  |  | 31,770 |  |  | 28,605 |
Total |  | $ | 90,611 |  | $ | 82,432 |  | $ | 77,123 |
*No other location individually exceeds 10% of total sales.
Revenue from External Customers by Products and Services [Table Text Block] | The composition of the Company’s net sales by product line is as follows (in thousands):
Net sales by product line |  | 2017 |  | 2016 |  | 2015 |
ICLs |  | $ | 68,325 |  | $ | 59,111 |  | $ | 51,543 |
IOLs |  |  | 17,258 |  |  | 19,706 |  |  | 19,857 |
Other surgical products |  |  | 5,028 |  |  | 3,615 |  |  | 5,723 |
Total |  | $ | 90,611 |  | $ | 82,432 |  | $ | 77,123 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] | The composition of the Company’s long-lived assets, consisting of property and equipment, net, and intangible assets, net, between those in the United States, Switzerland, and Japan is set forth below (in thousands):
Long-lived assets |  | 2017 |  | 2016 |
U.S. |  | $ | 8,523 |  | $ | 10,704 |
Switzerland |  |  | 912 |  |  | 737 |
Japan |  |  | 612 |  |  | 822 |
Total |  | $ | 10,047 |  | $ | 12,263 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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