16. Segment Information Reportable Segments The Companys 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 Companys reportable segments have been identified based on commonality and adjacency of technologies, applications and customers amongst the Companys 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 that it operates in three reportable segments: Photonics, Vision, and Precision Motion. The reportable segments and their principal activities consist of the following: Photonics The Photonics segment designs, manufactures and markets photonics-based solutions, including laser scanning, laser beam delivery, CO2 laser, solid state laser, 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 segments 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. Vision The Vision segment designs, manufactures and markets a range of medical grade technologies, including medical insufflators, pumps and related disposables; visualization solutions; wireless, recorder and video integration technologies for operating room integrations; 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 segments 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. Precision Motion The Precision Motion segment designs, manufactures and markets optical and inductive encoders, precision motor and motion control sub-assemblies, servo drives, air bearings, and air bearing spindles to customers worldwide. The vast majority of the segments 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. Reportable Segment Financial Information 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 Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Revenue Photonics $ 47,803 $ 58,286 $ 102,943 $ 117,511 Vision 64,740 65,895 133,748 131,831 Precision Motion 32,185 30,964 63,505 62,989 Total $ 144,728 $ 155,145 $ 300,196 $ 312,331 Three Months Ended Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Gross Profit Photonics $ 20,898 $ 27,308 $ 45,559 $ 54,622 Vision 24,515 25,211 51,090 51,184 Precision Motion 13,834 13,759 27,742 27,280 Unallocated Corporate and Shared Services (545 ) (496 ) (1,244 ) (1,015 ) Total $ 58,702 $ 65,782 $ 123,147 $ 132,071 Three Months Ended Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Gross Profit Margin Photonics 43.7 % 46.9 % 44.3 % 46.5 % Vision 37.9 % 38.3 % 38.2 % 38.8 % Precision Motion 43.0 % 44.4 % 43.7 % 43.3 % Total 40.6 % 42.4 % 41.0 % 42.3 % Three Months Ended Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Operating Income (Loss) Photonics $ 6,937 $ 11,666 $ 15,852 $ 23,976 Vision 4,665 4,215 10,299 8,772 Precision Motion 6,515 5,983 13,053 11,618 Unallocated Corporate and Shared Services (4,416 ) (6,759 ) (12,253 ) (14,868 ) Total $ 13,701 $ 15,105 $ 26,951 $ 29,498 Three Months Ended Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Depreciation and Amortization Expenses Photonics $ 2,790 $ 2,589 $ 5,439 $ 5,210 Vision 5,272 5,197 10,549 10,226 Precision Motion 1,333 1,183 2,686 2,552 Unallocated Corporate and Shared Services 42 71 93 126 Total $ 9,437 $ 9,040 $ 18,767 $ 18,114 Revenue by Geography 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 Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 United States $ 54,524 $ 62,010 $ 113,729 $ 126,770 Germany 22,148 18,838 45,381 42,315 Rest of Europe 30,713 35,971 63,798 66,741 China 17,472 15,392 32,876 30,500 Rest of Asia-Pacific 17,842 20,702 39,542 41,149 Other 2,029 2,232 4,870 4,856 Total $ 144,728 $ 155,145 $ 300,196 $ 312,331 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 segments remaining revenue . Revenue by End Market The Company primarily operates in two end markets: the medical market and advanced industrial market. Revenue by end market was approximately as follows: Three Months Ended Six Months Ended July 3, June 28, July 3, June 28, 2020 2019 2020 2019 Medical 55 % 55 % 57 % 55 % Advanced Industrial 45 % 45 % 43 % 45 % Total 100 % 100 % 100 % 100 % 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.