## 3 Results and Discussion
### Patents Landscape
A important trend is that not only is the global virtual reality market projected to grow from $6.30 billion in 2021 to $84.09 billion in 2028 [18], but this rise may be much greater, given that the COVID-19 epidemic boosted the usage of virtual reality even further [39]. As a consequence, this scenario suggests that the exponential increase in patenting filings related to virtual reality and design review and usability testing will continue for a few more years. The International Patent Classification (IPC) is an approach to determining a standard classification for registered patents, thereby enabling the search for and access to technical information accessible in documents connected to the same subject. The system is a hierarchical patent classification system used in over 100 countries to uniformly classify patent material. It creates a separation into classes and subclasses that are applicable to various technical domains and aids in the standardization of patent classification. Figure 3 illustrates the IPC classifications that we found in our review. Section G (Physics), which covers all physics-related material, is designated to all seven patent filings. As the class level progresses and technological information is described in more depth, the most frequent class is G06 (computing calculating or counting), with subclasses G06F (electric digital data processing), G06Q (data processing systems or methods), and G06T (image data processing or generation, in general). Other patents grouped under G Section are G02B (optical elements, systems, or apparatuses), G09G (arrangements or circuits for control of indicating devices using static means to present variable information), and G10L (speech analysis or synthesis; speech recognition; speech or voice processing; speech or audio coding or decoding). Section A (Human Necessities) was also used to classify one patent, grouped under the A61 class (medical or veterinary science; hygiene), with subclasses A61B (diagnosis; surgery; identification) and A61N (electrotherapy; magnetotherapy; radiation therapy; ultrasound therapy). Figure 3: International Patent Classification (IPC). In terms of benefits, we examined the seven patents in relation to the advantages of each invention, as described by its authors, and the novelty of each invention, i.e., the unique innovative feature introduced by the inventor that is not conventional and constitutes an improvement on existing technology. The JP2021068278A patent [33] proposes to provide a design review system and method that reduce the time required for computer-aided design (CAD) data conversion. The proposed design review system includes a CAD apparatus, into which CAD data are produced or edited, and a data conversion unit that performs the data conversion from CAD data to virtual reality data. The advantage of the invention is that the design review system shortens the time required for data conversion, such as data conversion from CAD data to virtual reality data. The US20210011593A1 patent [34] proposes a system for producing applications based on real-time accessibility assessments. The system identifies that a user is accessing an application on a device (such as a virtual-reality device), captures the real-time accessibility data, inputs it into a machine learning model, generates an accessibility score, and renders the application based on this score. The advantage of the invention is that the system identifies whether the user is accessing another application on the same user device and utilizes the accessibility score stored in a data repository to render the other application; if the amount of data stored in the data repository increase over a period of time, this improves the efficiency with which they are processed. The method enables the calculation of a real-time accessibility score to comprise the operating configurations of the user device, as well as the status of its hardware components, to establish internet connectivity in an effective manner. The CN111414084A [32] and CN111414083A patents [31] are related.