Perception and virtual reality

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We don’t live in a world of reality but in a world of perceptions…
Sometimes clever headset use or fixation, motion after effect, and context can create them in a hazard perception test.
The Colour that people perceive is an integrated visual perception of red, green and blue colour receptors in their eyes.
Staring at a particular colour for a long time can also cause chromatic adaptation, which causes our brain to change its colour perception of that object and other objects that we look at immediately after looking at the coloured object. We can create our reality.

The ability of speech and sensory perception to see, hear, or become aware of something through the senses can vary within the normal limits of human perception.
How something is regarded, understood, or interpreted can be influenced by other factors. Popular perceptions can be undone even of simple depth perception. 
Augmented and virtual reality can activate all the senses for immersion and experience.​

“It’s not what you look at that matters; it’s what you see.” — Henry David Thoreau.

​Japanese web designer Nobuyuki Kayahara created the spinning dancer in 2003 
William Hill’s 1915  My Wife and My Mother-in-Law” is a famous ambiguous image either perceived as a young girl or an old woman. A viewer’s perception can shift or show bias and determine the underlying neural structure for what is observed. The HTC Vive is a virtual reality headset that employs “room-scale” tracking technology, allowing the user to move in 3D space. Such virtual reality headsets and virtual reality simulation allow for an augmented reality from the virtual reality technology. Virtual reality games, commercial applications, and social VR means many eyes are in mixed reality.

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The optics of refraction can sometimes explain visual illusions

Light can bend or refract when it passes from one material to another. When the light goes through, say a glass, the light bends toward the center. Where the light all comes together is called the focal point, but beyond the focal point, the image appears as reversed. A hazard perception test can rely on this effect.

VISUAL PERSPECTIVE AND CONTRAST

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Contrast sensitivity defines the threshold between the visible and invisible. Computer testing can accurately estimate the threshold for a diverse range of stimuli and conditions. Researchers from the State University of New York’s College of Optometry are shedding new light on what keeps our eyes healthy. Their study finds daylight improves visual brain cells, helping people to distinguish faint details better.

The discovery could lead to improvements in smartphone screens, further protecting humans from poor vision habits. Too much screen time has already been linked to a phenomenon dubbed “computer vision syndrome.” Experiments on cats and humans showed bright light stimulates neurons in the visual cortex. The amount of reflected light, or luminance, can change by more than 10,000 times throughout the day.

Contrast sensitivity is strongly dependent on the amount of light. Increasing the number of light shifts the contrast sensitivity. If cortical neurons signal luminance contrast independently of light intensity, a bright sky would look very dark. Measurements of ON and OFF cortical functions could help to stimulate more accurately human luminance vision and prevent bright digital images from appearing too dark, the SUNY team writes in the journal Cell Reports.

 

Virtual Reality

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The road to virtual reality used today in a hazard perception test has come a long way since Wheatstone in 1838, who showed the brain’s capability to fuse two slightly different images into one by isolating a fixed image over each eye — creating a three-dimensional effect. Head-mounted displays (HMDs) were debuted in the 1950s and 1960s. In 1968, Ivan Sutherland created the first HMD with motion tracking and computer connectivity. In the 1990s and 2000s, the first versions of head tracking-capable VR devices were created. In 2007, Google launched Street View, which allows for a realistic representation of maps throughout the world, and in 2010, a stereoscopic 3D mode was implemented into the service. In 2014, FOVE announced the first eye-tracking VR headset. 

To achieve the best image clarity, lens spacing should line up with your IPD (interpupillary distances) with correct heights. The projected distance is not optical infinity, and instrument myopia can result. Most headsets can accommodate glasses and have additional inserts if needed. Many people need glasses, but some can use VR without. It depends on their condition. Some application examples include the HP Reverb2 VR headset used, e.g. for Microsoft flight simulator. The  Quest 2 requires your Facebook account to log in, making it easy to meet up with friends in VR and discover communities worldwide. The Setup involves the Oculus smartphone app with no PC or console needed.

The Microsoft Hololens is the rival of several flagship 3D VR headsets like HTC Vive, Oculus and many more. This is a one-of-a-kind self-contained hologram generator that is compatible with PC. Manufacturers such as HTC, Oculus, and Sony continue to develop immersive technology, including “stand-alone” headsets. Even a smartphone supplies the display and processing. There is some variation among different headsets with how they are set.

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