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
	April 2, 2021		April 3, 2020
Non-consignment sales	$	45,417	$	30,400
Consignment sales		5,335		4,787
Total net sales	$	50,752	$	35,187

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 was as follows (in thousands):

	Three Months Ended
	April 2, 2021		April 3, 2020
Domestic	$	2,340	$	1,739
Foreign:
China		19,643		11,715
Japan		9,603		8,302
Other⁽¹⁾		19,166		13,431
Total foreign sales		48,412		33,448
Total net sales	$	50,752	$	35,187

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 was as follows (in thousands):

	Three Months Ended
	April 2, 2021		April 3, 2020
ICLs	$	46,501	$	29,340
Other product sales
IOLs		3,725		3,994
Other surgical products		526		1,853
Total other product sales		4,251		5,847
Total net sales	$	50,752	$	35,187

One customer, the Company’s distributor in China, accounted for 39% and 33% of net sales for the three months ended April 2, 2021 and April 3, 2020, respectively. As of April 2, 2021 and January 1, 2021, respectively, one customer, the Company’s distributor in China, accounted for 37% and 46% of consolidated trade receivables.