In the following tables, sales are disaggregated by category, sales by geographic market and sales by product data. The following breaks down sales into the following categories (in thousands):

	Three Months Ended				Six Months Ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Non-consignment sales	$	35,556	$	29,661	$	63,822	$	51,842
Consignment sales		4,108		4,244		8,425		9,156
Total net sales	$	39,664	$	33,905	$	72,247	$	60,998

Note 14 — Disaggregation of Sales, Geographic Sales and Product Sales (Continued)

The Company markets and sells its products in over 75 countries and conducts its manufacturing in the United States. Other than China and Japan, the Company does not conduct business in any country in which its sales exceed 10% of worldwide consolidated net sales. Sales are attributed to countries based on location of customers. The composition of the Company’s net sales to unaffiliated customers is set forth below (in thousands):

	Three Months Ended				Six Months Ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
China	$	19,394	$	13,965	$	31,165	$	21,875
Japan		6,275		6,692		11,794		11,775
Other⁽¹⁾		13,995		13,248		29,288		27,348
Total net sales	$	39,664	$	33,905	$	72,247	$	60,998

	Three Months Ended				Six Months Ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
Domestic	$	2,114	$	1,895	$	4,066	$	3,651
Foreign		37,550		32,010		68,181		57,347
Total net sales	$	39,664	$	33,905	$	72,247	$	60,998

100% of the Company’s sales are generated from the ophthalmic surgical product segment and the chief operating decision maker makes operating decisions and allocates resources based upon the consolidated operating results, and therefore the Company operates as one operating segment for financial reporting purposes. The Company’s principal products are implantable Collamer lenses (“ICLs”) used in refractive surgery and intraocular lenses (“IOLs”) used in cataract surgery. The composition of the Company’s net sales by product line is as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 28, 2019		June 29, 2018		June 28, 2019		June 29, 2018
ICLs	$	34,432	$	27,292	$	62,218	$	48,450
Other product sales
IOLs		3,874		4,186		7,891		8,244
Other surgical products		1,358		2,427		2,138		4,304
Total other product sales		5,232		6,613		10,029		12,548
Total net sales	$	39,664	$	33,905	$	72,247	$	60,998

One customer, our distributor in China, accounted for 49% and 43% of net sales for the three and six months ended June 28, 2019, respectively, and the same customer accounted for 41% and 36% of net sales for the three and six months ended June 29, 2018, respectively. As of June 28, 2019 and December 28, 2018, respectively, one customer, our distributor in China, accounted for 48% and 37% of consolidated trade receivables.