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A 3-D animated creature, affectionately named Gerald, appears to walk in circles while floating in front of an elaborate viewer that resembles something from an optometrist’s office. Though only half a foot high, and with four arms, he looks remarkably lifelike through lenses that transmit what computer scientists and optical engineers describe as a “digital light field” into the eyes of a viewer.

The technology, once downsized into a pair of glasses, is intended to overcome the most significant technical challenges blocking an explosion of virtual reality.

Though the industry could radically transform entertainment, gaming and other forms of computing, it has an Achilles’ heel: Many people become queasy after pulling viewing devices over their eyes and slipping into an immersive world that blurs the line between physical reality and computer-generated imagery.

Oculus Rift, the crowdfunded startup acquired by Facebook for $2 billion in March, has been trying to correct this motion sickness. But it is a steep challenge. Nearly 50 years after computer scientist Ivan Sutherland pioneered head-mounted computer displays, there are more than two dozen companies that have attempted to commercialize various forms of the technology, called near-eye displays, with little success.

“The near-eye-display market is a graveyard of broken dreams,” said David Luebke, senior director of research at Nvidia Corp., a Silicon Valley computer graphics company.

Whether it comes in bulky goggles that block out the actual world, or in sleeker glasses that allow users to see their true surroundings blended with computer images (known as augmented reality), the technology is based on showing images to both eyes at once. Inevitably, though, many users endure “simulator sickness” and other kinds of discomfort, like headaches and fatigue. Some of it stems from a disorienting lag between the rapid turn of one’s head and the time it takes for the computer to catch up and generate a new set of images to reflect the changing scenery.

Another issue is the disconnect between where the images appear to be – picture a cloud in the sky far away – and where they actually are – on small screens only inches from the user’s eyes. Experts call this unsettling dissonance the “vergence-accommodation conflict.”

“Visual head-mounted display devices are causing a variety of symptoms in patients,” said Dr. Joseph F. Rizzo III, a professor of ophthalmology at Harvard Medical School. “Prolonged use of devices that create symptoms might induce more chronic change.”

Google Glass gets around these issues by using a single display in the corner of one eye, not two. But it cannot produce 3-D images or create the immersive experience that many gamers and other kinds of users crave.

Gerald’s creator, the startup Magic Leap Inc., is trying a different approach, using a digital light field. Unlike a conventional digital stereo image, which comes from projecting two slightly displaced images with different colors and brightness, Magic Leap says its digital light field encodes more information about a scene to help the brain make sense of what it is looking at, including the scattering of light beams and the distance of objects.

Magic Leap and other researchers say that digital light fields will circumvent visual and neurological problems by providing viewers with depth cues similar to the ones generated by natural objects. That will make it possible to wear augmented-reality viewers for extended periods without discomfort, they say.

Light-field technology is already being used in a new generation of digital cameras that offer the ability to change the point of focus after a picture has been taken. Researchers at Nvidia demonstrated a head-mounted light-field system last year, and scientists at the MIT Media Lab have shown an “autostereoscopic,” or glasses-free, 3-D display based on what they described as a “compressed light field.”

So far, however, one of the principal obstacles facing light-field cameras and displays is that they require as many as five or six times as many pixels to create the resolution equivalent to a conventional digital image.

Magic Leap claims to have solved the resolution challenge with a proprietary technology that projects an image, which they describe as a “3-D light sculpture,” onto the viewer’s retina.

Virtual- and augmented-reality aficionados foresee a world in which conventional computer screens and televisions are obsolete, and it is possible to project lifelike animations into meetings anywhere.