What is augmented reality?
Augmented Reality (AR) is a technology that superimposes digital information (such as 3D models, text, technical diagrams, or animations) directly onto a user's view of the physical world. Unlike virtual reality, which encloses the user in a simulated environment, AR keeps the physical surroundings visible and enhances them by displaying contextual digital elements on smartphone screens, tablets, or transparent optical smart glasses.
How augmented reality works in practice
AR relies on cameras, sensors, and computer vision software to interpret the physical environment and anchor digital elements in real time. Ronald Azuma's foundational 1997 survey defines AR by three characteristics: it combines real and virtual content, it is interactive in real time, and it registers virtual objects accurately in 3D space relative to the real world. Azuma, 1997
Key delivery methods and technologies include:
- Mobile AR: Standard smartphones and tablets use their built-in rear cameras, gyroscopes, and accelerometers to place digital objects onto surfaces. Google's ARCore documentation describes this as combining motion tracking (following distinctive points in the camera image to work out the phone's position), environmental understanding (detecting horizontal, vertical and angled surfaces), and light estimation (matching virtual object lighting to the real room). Google ARCore documentation
- Optical see-through smart glasses: Wearable glasses with transparent lenses or waveguide optics that project light directly into the wearer's line of sight, allowing them to view digital information hands-free while looking directly at the real room.
- Web-based AR (WebAR): Lightweight AR experiences accessible directly through mobile web browsers via a URL or QR code, removing the need for users to download and install a dedicated application.
- Surface detection and plane finding: Computer vision algorithms analyse camera feeds to identify horizontal surfaces (such as floors and tables) and vertical surfaces (such as walls), ensuring virtual objects rest naturally on physical planes.
- Simultaneous Localisation and Mapping (SLAM): A computational process that maps an unfamiliar physical environment while simultaneously keeping track of the device's location within that space.
- Image and marker recognition: The system recognises specific 2D visual targets (such as printed QR codes, machinery labels, or illustrations) to trigger relevant 3D models or instructional overlays at precise physical locations.
- Lighting estimation: Software detects the direction and intensity of real-world ambient lighting so that digital graphics cast realistic shadows, helping them blend visually with the physical environment.
What it feels like to use AR
Using AR allows people to interact with digital information without losing situational awareness. Because the physical world remains fully visible, users can move naturally, interact with colleagues, and remain aware of physical obstacles and safety hazards.
On mobile devices, viewing is framed through the device screen, making it accessible but requiring the user to hold the phone or tablet. On smart glasses, digital graphics appear directly in front of the eyes, though the field of view (the angular area where digital overlays are visible) is typically narrower than natural human peripheral vision.
Where augmented reality is commonly used
Organisations use AR across multiple industries to provide contextual, hands-on support:
- Field service, maintenance, and assembly: Technicians view digital schematics, part labels, and step-by-step assembly guides projected directly over industrial equipment, reducing reliance on paper manuals.
- Remote expert assistance: Field workers share their live camera feed with an off-site specialist who can draw annotations, arrows, and visual guidance directly onto the technician's screen in real time.
- Logistics and warehousing: Warehouse staff use visual prompts on mobile devices or wearable displays to navigate aisles efficiently and identify correct items for picking.
- Education and interactive learning: Students explore 3D anatomical models, chemical structures, and architectural landmarks overlaid on classroom desks, making abstract concepts easier to understand.
- Cultural events and public exhibitions: Museums, galleries, and event organisers provide interactive visitor guides where historical artefacts or artworks reveal animated stories and extra context when scanned.
Augmented reality in practice at PTR
PTR's published AR work is deliberately modest next to its VR case studies. The one confirmed, live example is the AR Business Card on Labs Demos, an augmented reality business card experience anyone can try in the browser. PTR also lists "AR Applications" among its custom-build capabilities, described as bringing print materials, physical environments or artwork to life with interactive AR overlays, but there are no AR-specific case studies, client names or outcome figures in PTR's published work to cite here. That is worth saying plainly rather than working around: AR is part of PTR's stated capability, but its VR practice is what has been delivered and evaluated with clients so far.
Common confusions about AR
While selfie filters and consumer games are popular applications of AR, the underlying technology is widely used in enterprise operations, healthcare guidance, and technical training.
Standard AR overlays digital information onto the environment like a heads-up display. Mixed Reality involves deeper environmental integration, where digital objects can be occluded (hidden behind physical objects) and interact dynamically with the physics of the physical room.
While smart glasses continue to mature, engineering constraints around battery weight, heat dissipation, and optical display brightness mean lightweight, all-day consumer glasses remain an evolving technology.
A 2023 IEEE systematic review of 64 published AR training systems found that most were evaluated on technical measures, such as task completion time and error counts, rather than on deeper pedagogical outcomes. A working AR demo and a rigorously evaluated training outcome are two different claims, and it is worth checking which one a vendor is actually making.
Is augmented reality the right fit?
- Users need contextual, hands-on guidance, such as assembly diagrams or maintenance steps over physical equipment.
- Broad accessibility matters, since most modern smartphones and tablets support AR with no new hardware.
- Real-world context must stay visible, as in public exhibitions, museum displays, or facility wayfinding.
- Precision-critical or safety-critical alignment: Consumer-grade AR tracking can drift or misregister over time and distance. Tasks needing exact, certified measurements usually still need dedicated instruments.
- Poor lighting or highly reflective environments: AR's surface detection and tracking rely on camera input, and it degrades in very low light, direct glare, or environments with few visual features to track against.
- Extended hands-free wear at scale: Smart glasses remain limited by battery life and heat, so long shifts or large deployments across a workforce are a real constraint today, not a solved problem.
- Deep environmental interaction: If virtual objects need to hide behind furniture, collide with real surfaces, or persist accurately in a mapped room over time, that is Mixed Reality's job, not basic AR's.
To see how augmented reality solutions are applied in enterprise and learning, visit the XR overview page.
AR adds digital content on top of the real world without replacing it. That is what makes it useful for hands-on, in-the-moment guidance, and it is also why AR alone cannot let digital objects react to real surfaces the way mixed reality can.
Sources and further reading
- A Survey of Augmented Reality (Azuma) - Presence: Teleoperators and Virtual Environments, MIT Press, 1997
- How It Works (ARCore developer documentation) - Google, updated 2024
- Systematic Review of Augmented Reality Training Systems (Butaslac et al.) - IEEE Transactions on Visualization and Computer Graphics, 2023
- A Taxonomy of Mixed Reality Visual Displays (Milgram and Kishino) - IEICE Transactions on Information and Systems, 1994
AR Business Card demo on Labs · PTR's Augmented Reality page