Note 9 — Disaggregation of Revenues, Geographic Sales and Product Sales

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

	Three Months Ended
	March 30, 2018		March 31, 2017
Non-consignment sales	$	22,181	$	15,756
Consignment sales		4,912		4,594
Total net sales		27,093		20,350
Royalty income ⁽¹⁾		157		131
Total revenues	$	27,250	$	20,481

⁽¹⁾

Shown as a separate line item in other income, net on the Condensed Consolidated Statements of Operations.

The Company markets and sells its products in over 75 countries and conducts its manufacturing in the United States. Other than China, Japan, the United States and Korea, 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
	March 30, 2018		March 31, 2017
China	$	7,910	$	4,626
Japan		5,083		3,799
Korea		2,195		1,426
United States		1,756		1,958
Other⁽¹⁾		10,149		8,541
Total net sales	$	27,093	$	20,350

⁽¹⁾ No other location individually exceeds 10% of the total sales.

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
	March 30, 2018		March 31, 2017
ICls	$	21,158	$	15,271
Other product sales
IOLs		4,058		4,606
Other surgical products		1,877		473
Total other product sales		5,935		5,079
Total net sales	$	27,093	$	20,350

One customer, our distributor in China, accounted for 29% and 23% of net sales for the three ended March 30, 2018 and March 31, 2017, respectively. As of March 30, 2018 and December 29, 2017, respectively, one customer, our distributor in China, accounted for 31% and 24% of consolidated trade receivables.