The Company’s Chief Operating Decision Maker (“CODM”) utilizes financial information to make decisions about allocating resources and assessing performance for the entire Company. The Company evaluates the performance of, and allocates resources to, its segments based on revenue, gross profit and operating profit. The Company’s reportable segments have been identified based on commonality and adjacency of technologies, applications and customers amongst the Company’s individual product lines. The Company determined that disclosing revenue by specific product was impracticable due to the highly customized and extensive portfolio of technologies offered to customers.

Based upon the information provided to the CODM, the Company has determined it operates in three reportable segments: Photonics, Vision, and Precision Motion. The reportable segments and their principal activities consist of the following:

The Photonics segment designs, manufactures and markets photonics-based solutions, including laser scanning, laser beam delivery, CO2 laser, continuous wave and ultrafast laser, and optical light engine products to customers worldwide. The segment serves highly demanding photonics-based applications for advanced industrial processes, metrology, medical and life science imaging, DNA sequencing, and medical laser procedures. The vast majority of the segment’s product offerings are sold to OEM customers. The segment sells these products both directly, utilizing a highly technical sales force, and indirectly, through resellers and distributors.

The Vision segment designs, manufactures and markets a range of medical grade technologies, including medical insufflators, pumps and related disposables; visualization solutions; wireless imaging and operating room integration technologies; optical data collection and machine vision technologies; radio frequency identification (“RFID”) technologies; thermal chart recorders; spectrometry technologies; and embedded touch screen solutions. The vast majority of the segment’s product offerings are sold to OEM customers. The segment sells these products both directly, utilizing a highly technical sales force, and indirectly, through resellers and distributors.

The Precision Motion segment designs, manufactures and markets optical and inductive encoders, precision motor and motion control sub-assemblies, air bearings, air bearing spindles and precision machined components to customers worldwide. The vast majority of the segment’s product offerings are sold to OEM customers. The segment sells these products both directly, utilizing a highly technical sales force, and indirectly, through resellers and distributors.

Revenue, gross profit, gross profit margin, operating income (loss), and depreciation and amortization expenses by reportable segment were as follows (in thousands, except percentage data):

	Three Months Ended
	March 29,		March 30,
	2019		2018
Revenue
Photonics	$	59,225	$	61,831
Vision		65,936		56,209
Precision Motion		32,025		28,925
Total	$	157,186	$	146,965

	Three Months Ended
	March 29,			March 30,
	2019			2018
Gross Profit
Photonics	$	27,314		$	29,555
Vision		25,973			19,721
Precision Motion		13,521			13,260
Unallocated Corporate and Shared Services		(519	)		(377	)
Total	$	66,289		$	62,159

	Three Months Ended
	March 29,			March 30,
	2019			2018
Gross Profit Margin
Photonics		46.1	%		47.8	%
Vision		39.4	%		35.1	%
Precision Motion		42.2	%		45.8	%
Total		42.2	%		42.3	%

	Three Months Ended
	March 29,			March 30,
	2019			2018
Operating Income (Loss)
Photonics	$	12,310		$	15,323
Vision		4,557			475
Precision Motion		5,635			8,607
Unallocated Corporate and Shared Services		(8,109	)		(7,178	)
Total	$	14,393		$	17,227

	Three Months Ended
	March 29,		March 30,
	2019		2018
Depreciation and Amortization Expenses
Photonics	$	2,621	$	3,067
Vision		5,029		5,174
Precision Motion		1,369		503
Unallocated Corporate and Shared Services		55		323
Total	$	9,074	$	9,067

The Company aggregates geographic revenue based on the customer location where products are shipped. Revenue from these customers was as follows (in thousands):

	Three Months Ended
	March 29,		March 30,
	2019		2018
United States	$	64,760	$	58,113
Germany		23,477		20,069
Rest of Europe		30,770		27,060
China		15,108		15,603
Rest of Asia-Pacific		20,447		24,720
Other		2,624		1,400
Total	$	157,186	$	146,965

The majority of revenue from our Photonics, Vision and Precision Motion segments is generated from sales to customers within the United States and Europe. Each segment also generates revenue across the other geographies, with no significant concentration of any segment’s remaining revenue.

The Company primarily operates in two end markets: the advanced industrial market and the medical market. Revenue by end market was approximately as follows:

The majority of revenue from the Photonics and Precision Motion segments is generated from sales to customers in the advanced industrial market. The majority of revenue from the Vision segment is generated from sales to customers in the medical market.