###### Abstract  
This study investigated the effects of wearing AR devices on users' performance and comfort ratings while performing order-picking (OP) tasks. In addition to a picking-by-paper list, two AR devices combined with three order information display designs were examined. Thirty adult participants joined. They searched for and found the boxes in the order list, picked them up, and returned to the origin. The time to complete the task and the number of incorrect boxes picked up were analyzed to assess the performance of the tasks. The subjective ratings of the participants on the comfort rating scale (CRS) and the simulator sickness questionnaire (SSQ) were collected to assess the designs of both the AR devices and the order information displays. It was found that the participants could complete the OP tasks faster when adopting the order map (4.97 \(\pm\) 1.57 min) or the 3D graph display (4.87 \(\pm\) 1.50 min) using either one of the AR devices than when using a paper list (6.03 \(\pm\) 1.28 min). However, they needed more time to complete the OP tasks when wearing both types of AR glasses when the Quick Response (QR) code option was adopted (10.16 \(\pm\) 4.30 min) than when using a paper list. The QR code scanning and display design using either one of the AR devices guaranteed 100% accuracy but sacrificed efficiency in task completion. The AR device with a binocular display and hand gesture recognition functions had a significantly lower CRS score in the dimensions of attachment and movement (5.6 and 6.3, respectively) than the corresponding dimensions (8.0 and 8.3, respectively) of the other device with a monocular and hand touch input design. There were complaints of eye strain after using both AR devices examined in this study. This implies that these AR devices may not be suitable to wear for extended periods of time. Users should take off the AR device whenever they do not need to view the virtual image to avoid eye strain and other discomfort symptoms. augmented reality; warehousing management; order information display; comfort/discomfort 2023130402202313040220231304022023130402202313040220231304022023130402202023130402202023130402202023130402202023130402202020231304022020231304022020231304022020231304022  
While mobile devices such as tablets and smartphones also offer AR functionalities, head-mounted displays (HMDs) and AR glasses provide a hands-free experience and deliver superior user satisfaction compared to handheld devices [11; 12; 13]. Order picking (OP) is typical in logistics and service industries and is commonly performed in warehousing and retail operations. It is a labor-intensive job that requires operators to go to storage areas to find and collect designated items and is the most expansive operation in warehouses [14; 15]. The traditional method of OP involves operators finding listed items on paper or on a tablet and picking them up [16]. Using AR glasses is one alternative for performing such tasks. AR glasses have been adopted in OP tasks by providing visual guidance information when searching for items in a storage area [17; 18]. They allow workers to access logistic information in a hands-free manner [14; 19; 20; 21; 22; 23; 24;  
The findings in the literature [15; 16; 43; 44] concerning the benefits of using AR devices are inconsistent. More studies are needed to confirm these benefits. HMD AR glasses predominantly comprise a unit of display and an input component. The visual display may be monocular or binocular. The input component may be a physical input device, such as a touch pad and buttons, or a more advanced hand gesture recognition device. The visual display and input design may affect the performance and comfort/discomfort of the user. It was our anticipation that the AR glasses with a binocular display would provide a better visual experience than the monocular ones, and that the AR glasses with a hand gesture recognition input design would allow faster hand input operations in performing OP tasks than those with a touch pad and buttons design.