## 6 Results and Findings  
The Technology Readiness Level (TRL) is a metric introduced by the European Commission that employs a 1-9 scale to assess studies based on their level of technological preparedness, such as implementation and validation stages, as cited in [7]. The scale is broken down as follows: (1) observation of fundamental principles, (2) conceptualization of the technology, (3) empirical evidence of the concept, (4) lab-based validation of the technology, (5) validation in a pertinent setting (industry-relevant context for key technologies), (6) technology demonstration in a relevant setting (industry-relevant in the case of key technologies),(7) prototype system exhibited in a functional environment, (8) fully developed and certified system, (9) validated system in an operational context. In this paper, all reviewed studies have been analyzed by rigorously adhering to every guideline stated in the methodology, and these technologies have been scored according to the TRL index. The exploration of AR across various domains, as detailed in the previous section, underscores the vast potential of AR technologies in a multitude of sectors. From education to healthcare, and through to manufacturing and industrial processes, AR is reshaping how people perceive and interact with the world, and in the process, transforming traditional workflows and practices. In the education and training sector, the inclusion of AR into learning environments has fundamentally enhanced the educational experience, making it more engaging and immersive. Whether by bringing textbook content to life, enabling collaborative learning experiences, or training aspiring professionals in high-stakes industries, AR is making learning more dynamic and interactive. Similarly, healthcare and medical applications of AR are revolutionizing patient care and medical procedures. By providing surgeons with \"X-ray vision\" and making physical therapy more enjoyable, AR is improving patient outcomes and transforming the medical landscape. In the industrial and manufacturing sectors, AR's ability to overlay digital information onto the physical world is improving efficiency, accuracy, and safety. From enhancing worker training to guiding technicians during complex tasks and facilitating product design and quality control, AR is fast becoming an indispensable tool in these domains. These findings underscore that AR's potential is immense and widespread across various sectors. Yet, it is essential to understand that the adoption and effective implementation of AR are contingent on overcoming certain challenges, including technological limitations, user acceptance, and ethical considerations. As future technology continues to navigate this relatively nascent terrain, ongoing research and development will be pivotal in realizing the full potential of AR in these and other domains. Table 2 outlines the emerging technology trends in AR, summarizing diverse elements such as: AR Technology, Paper Reference, Commercial Application, Sector, Publication Classification, Hardware, Software, Connectivity, Protocol, and TRL index. The findings in Table 2 show those technologies that are more advanced in terms of TRL. In this sense, although all the research presents several technologies only those more advanced are highlighted in Table 2 to align with the purpose of the methodology. Note that the hardware in every application always is a series of devices that work together in order to implement the AR technology, the same occurs with the software part. The main sectors that are involved in AR trends are mostly medical, urban planning, and entertainment. Publication classification in all of these selected studies is \"Computer Science\" due to the nature of this technology (the development of AR applications implies various software implementations).