Field of View

In the context of augmented reality (AR) and virtual reality (VR) technologies, the "field of view" (FoV) refers to the size of the observable world that can be seen through the headset or display device at any given time. It is critical to how immersive and realistic an AR experience is for the user.

Importance of field of view

• Immersion: A larger field of view increases immersion, making the virtual environment seem larger and more real.
• Natural interaction: A larger field of view allows the user to see more of the virtual or augmented world without having to turn their head excessively, making interaction in these environments feel more natural and intuitive.
• Visual comfort: A wider field of view can reduce the sense of tunnel vision and disorientation often experienced with narrow field of view devices.

Technical aspects

• Measurement: FOV is typically measured in degrees. Most VR headsets aim for an FOV that matches the human field of view, which is about 180 degrees horizontally.
  However, many current VR headsets offer an FOV between 90 and 110 degrees.
• Limitations: Increasing the FOV can present challenges, such as increased computing and graphics rendering requirements. It can also lead to lens design issues.

Field of view AR vs. VR

• AR technologies: In AR, the field of view determines how much of the real world can be overlaid with digital content. A narrow field of view in AR devices can limit the effectiveness of augmented reality overlays, making the technology feel less integrated into the real world.
• VR technologies: In VR, FOV is critical to creating a fully immersive environment where the physical world is blanked out and replaced with a virtual one.

Extending the FOV of AR and VR devices is a major focus of ongoing research and development to create even more realistic experiences.

Features and characteristics

• Unit: FOV is typically measured in degrees (°).
• Application: In VR and AR, FOV determines how much of the virtual or augmented environment the user can see.
• Comparison: Typical human FOV is approximately 180° horizontally and 135° vertically.
• VR headsets: Oculus Rift (about 110°), HTC Vive (about 110°) and Valve Index (about 130°).
• AR devices: Microsoft HoloLens and Magic Leap have a smaller FOV than VR headsets, often in the range of 40° to 90°.
• Optical distortion: A larger FOV can lead to optical distortion, which is minimized by special lenses and software corrections.